INSTALL PLUGIN and UNINSTALL PLUGIN worked with statement-based and
mixed-mode replication only, but not with row-based replication.

There is no statement-based replication of these statements.
But there was row-based replication of the inserts and deletes
to and from the mysql.plugin table.

The fix is to suppress binlogging during insert and delete to
and from the mysql.plugin table.


mysql-test/suite/rpl/r/rpl_plugin_load.result:
  new result file
mysql-test/suite/rpl/t/rpl_plugin_load-master.opt:
  new opt file
mysql-test/suite/rpl/t/rpl_plugin_load-slave.opt:
  new opt file
mysql-test/suite/rpl/t/rpl_plugin_load.test:
  new test
sql/sql_plugin.cc:
  Suppress binlogging during insert and delete to/from the
  mysql.plugin table.