Execution of certain BINLOG statements while having temporary tables
open by HANDLER statements caused server crash.

Execution of BINLOG statements for Start/Format_description events
may close the connection's temporary tables. If a handler had been associated
with a temporary table, the BINLOG statement's call to close_temporary_tables()
would result in dangling pointers to the now freed TABLE in
thd->handler_table_hash. Similarly, a dangling pointer would also be left if
there was a lock on the temporary table. Running with valgrind showed that
freed memory was being accessed.

Solution: Properly close handlers and remove locks associated with temporary
tables being closed by the BINLOG statement.

(cherry picked from commit 11507ffa1df94c1d4df78f3b9b9d4de591ebc43e)

Conflicts:
	sql/sql_base.cc

Changes to a GTID related comment. Retained the version from 5.6.