This changeset adds replication of events and user-defined functions. 
There are several bug reports involved in this change:

BUG#16421, BUG#17857, BUG#20384:
This patch modifies the mysql.events table to permit the addition of
another enum value for the status column. The column now has values
of ('DISABLED','SLAVESIDE_DISABLED','ENABLED'). A status of
SLAVESIDE_DISABLED is set on the slave during replication of events.
This enables users to determine which events werereplicated from the 
master and to later enable them if they promote the slave to a master.
The CREATE, ALTER, and DROP statements are binlogged.
A new test was added for replication of events (rpl_events).

BUG#17671:
This patch modifies the code to permit logging of user-defined functions.
Note: this is the CREATE FUNCTION ... SONAME variety. A more friendly error 
message to be displayed should a replicated user-defined function not be
found in the loadable library or if the library is missing from the
slave.The CREATE andDROP statements are binlogged. A new test was added 
for replication of user-defined functions (rpl_udf). 

The patch also adds a new column to the mysql.event table named
'originator' that is used to store the server_id of the server that
the event originated on. This enables users to promote a slave to a 
master and later return the promoted slave to a slave and disable the
replicated events.


mysql-test/lib/init_db.sql:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the SLAVESIDE_DISABLED to the list of enumerated 
  values for the mysql.event table.
  
  This patch adds the column 'originator' to the mysql.event table.
mysql-test/r/events.result:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the 'originator' column to the events test results.
  This was necessary to ensure the manual insert into mysql.event table 
  succeeds because the originator column is set to NOT NULL.
mysql-test/r/events_grant.result:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the 'originator' column to the events_grant test results.
  This was necessary to ensure the manual insert into mysql.event table 
  succeeds because the originator column is set to NOT NULL.
mysql-test/r/events_restart_phase1.result:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the 'originator' column to the events_restart_phase1
  test results. This was necessary to ensure the manual insert into 
  mysql.event table succeeds because the originator column is set to 
  NOT NULL.
mysql-test/r/system_mysql_db.result:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the SLAVESIDE_DISABLED to the list of enumerated 
  values for the mysql.event table.
  
  This patch adds the column 'originator' to the mysql.event table.
  
  These changes to the result file were necessary to ensure correct test
  results.
mysql-test/t/events.test:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the 'originator' column to the events
  test. This was necessary to ensure the manual insert into 
  mysql.event table succeeds because the originator column is set to 
  NOT NULL.
mysql-test/t/events_restart_phase1.test:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the 'originator' column to the events_restart_phase1
  test. This was necessary to ensure the manual insert into 
  mysql.event table succeeds because the originator column is set to 
  NOT NULL.
scripts/mysql_create_system_tables.sh:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the SLAVESIDE_DISABLED to the list of enumerated 
  values for the mysql.event table.
  
  This patch adds the column 'originator' to the mysql.event table.
scripts/mysql_fix_privilege_tables.sql:
  WL#3629 - Replication of Invocation and Invoked Feature
  This patch adds the SLAVESIDE_DISABLED to the list of enumerated 
  values for the mysql.event table.
  
  This patch adds the column 'originator' to the mysql.event table.
sql/event_data_objects.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit processing of the new enum
  SLAVESIDE_DISABLED which is set on the slave during replication
  of events. 
  
  This patch uses the new Event_basic:: enumerated values.
sql/event_data_objects.h:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch moves the duplicated enumeration values for ENABLED, 
  SLAVESIDE_DISABLED, and DISABLED to the Event_basic class removing
  them from the other Event_* classes.
sql/event_db_repository.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit processing of the new enum
  SLAVESIDE_DISABLED which is set on the slave during replication
  of events. 
  
  The patch also adds a new column to the mysql.event table named
  'originator' that is used to store the server_id of the server that
  the event originated on. This enables users to promote a slave to a 
  master and later return the promoted slave to a slave and disable the
  replicated events.
sql/event_db_repository.h:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to add a new field named 'originator' 
  to the enum_event_table_field and associated structure.
sql/event_queue.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit processing of the new enum
  SLAVESIDE_DISABLED which is set on the slave during replication
  of events.
sql/events.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit processing of the new enum
  SLAVESIDE_DISABLED which is set on the slave during replication
  of events.
sql/lex.h:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to add the new SLAVESIDE_DISABLE symbol
  to the lexical parser.
sql/slave.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit the capture of the error on
  the slave when a UDF from a loadable library is not loaded on the server
  when replicated from the master.
sql/sql_parse.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch removes the comment because drop functions commands 
  are replicated.
sql/sql_show.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to permit processing of the new enum
  SLAVESIDE_DISABLED which is set on the slave during replication
  of events. The code also adds changes the display width of the status
  column for the schema table for the show events command and also adds
  the new column 'originator' to the events_field_info structure.
sql/sql_udf.cc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to add the binlogging of the create and
  drop function events.
sql/sql_yacc.yy:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch modifies the code to change the enumeration of the status
  column for the events in the parser. The code uses the Event_basic::
  enumerations allowing the enums to be defined in one place.
mysql-test/t/rpl_events.test:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new test for testing replication of events. The test
  uses include files so that the test can test under both RBR and SBR.
mysql-test/r/rpl_events.result:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new result file for testing replication of events.
mysql-test/r/rpl_udf.result:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new result file for testing replication of UDFs.
mysql-test/t/rpl_udf.test:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new test for testing replication of UDFs. The test
  uses include files so that the test can test under both RBR and SBR.
mysql-test/include/rpl_events.inc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new include file for testing replication of events.
  This file contains the core test procedures.
mysql-test/include/rpl_udf.inc:
  WL#3629 - Replication of Invocation and Invoked Features
  This patch adds a new include file for testing replication of UDFs.
  This file contains the core test procedures.