mysqlbinlog --database parameter was being ignored when processing
row events. As such no event filtering would take place.
            
This patch addresses this by deploying a call to shall_skip_database
when table_map_events are handled (as these contain also the name of
the database). All other rows events referencing the table id for the
filtered map event, will also be skipped.

client/mysqlbinlog.cc:
  Added shall_skip_database call to the part of the code that handles 
  Table_map_log_events. It inspects the database name and decides whether
  to filter the event or not. Furthermore, if table map event is filtered
  next events referencing the table id in the table map event, will also
  be filtered.
mysql-test/suite/binlog/t/binlog_row_mysqlbinlog_db_filter.test:
  Test case that checks if row events are actually filtered out.
sql/log_event.h:
  Added a map for holding the currently ignored table map events.
  Table map events are inserted when they shall be skipped and removed
  once the last row event in the statement is processed.