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Intermediate commit. This commit implements that record_gtid() selects a gtid_slave_posXXX table with a storage engine already in use by current transaction, if any. The default table mysql.gtid_slave_pos is used if no match can be found on storage engine, or for GTID position updates with no specific storage engine. Table discovery of mysql.gtid_slave_pos* happens on initial GTID state load as well as on every START SLAVE. Some effort is made to make this possible without additional locking. New tables are added using lock-free atomics. Removing tables requires stopping all slaves first. A warning is given in the error log when a table is removed but a non-stopped slave still has a reference to it. If multiple mysql.gtid_slave_posXXX tables with same storage engine exist, one is chosen arbitrarily to be used, with a warning in the error log. GTID data from all tables is still read, but only one among redundant tables with same storage engine will be updated.