bzr push into mysql-5.1-bugteam branch (Georgi.Kodinov:3524 to 3525)

[Georgi Kodinov]

 3525 Georgi Kodinov	2010-11-29 [merge]
      null merge

 3524 Li-Bing.Song@stripped	2010-11-28
      BUG#54903 BINLOG statement toggles session variables
      
      When using BINLOG statement to execute rows log events, session variables
      foreign_key_checks and unique_checks are changed temporarily.  As each rows
      log event has their own special session environment and its own
      foreign_key_checks and unique_checks can be different from current session
      which executing the BINLOG statement. But these variables are not restored
      correctly after BINLOG statement. This problem will cause that the following
      statements fail or generate unexpected data.
      
      In this patch, code is added to backup and restore these two variables.
      So BINLOG statement will not affect current session's variables again.
     @ mysql-test/extra/binlog_tests/binlog.test
        Add test to verify this patch.
     @ mysql-test/suite/binlog/r/binlog_row_binlog.result
        Add test to verify this patch.
     @ mysql-test/suite/binlog/r/binlog_stm_binlog.result
        Add test to verify this patch.
     @ sql/sql_binlog.cc
        Add code to backup and restore thd->options.

    modified:
      mysql-test/extra/binlog_tests/binlog.test
      mysql-test/suite/binlog/r/binlog_row_binlog.result
      mysql-test/suite/binlog/r/binlog_stm_binlog.result
      sql/sql_binlog.cc
No bundle (reason: useless for push emails).