innobase/include/lock0lock.h:
  Add lock_table_unlock() and lock_release_tables_off_kernel()
  Add LOCK_TABLE_EXP
innobase/include/row0mysql.h:
  Add row_unlock_table_for_mysql() and row_lock_table_for_mysql()
innobase/include/trx0trx.h:
  Add n_tables_locked
innobase/lock/lock0lock.c:
  Add LOCK_TABLE_EXP for explicit LOCK TABLE commands
  Add lock_table_unlock()
  Add lock_release_tables_off_kernel()
innobase/row/row0mysql.c:
  Add row_unlock_table_for_mysql() and row_lock_table_for_mysql()
innobase/trx/trx0trx.c:
  Add n_tables_locked
mysql-test/r/innodb.result:
  Updated handling of auto_inc columns
sql/ha_innodb.cc:
  Call row_lock_table_for_mysql() and row_unlock_table_for_mysql()