With this patch, statements that change metadata (in the mysql database)
is logged as statements, while normal changes (e.g., using INSERT, DELETE,
and/or UPDATE) is logged according to the format in effect.

The log tables (i.e., general_log and slow_log) are not replicated at all.

With this patch, the following statements are replicated as statements:
GRANT, REVOKE (ALL), CREATE USER, DROP USER, and RENAME USER.


mysql-test/extra/binlog_tests/binlog.test:
  Added test to check that normal INSERT, DELETE, and UPDATE to a table in
  the mysql database is replicated both under row-based and statement-based
  replication.
mysql-test/r/binlog_row_binlog.result:
  Result change.
mysql-test/r/binlog_stm_binlog.result:
  Result change.
sql/handler.cc:
  Removed hardcoded check for mysql database.
  Added table-specific flag for non-replication (used by log tables).
sql/log.cc:
  Adding flag that a table shall not be replicated and set it for log
  tables.
sql/sp.cc:
  Turning row-based replication off for statements that change metadata.
sql/sql_acl.cc:
  Turning row-based replication off for statements that change metadata.
sql/table.h:
  Adding flag that a table shall not be replicated.