MDEV 15532 Assertion `!log->same_pk' failed in row_log_table_apply_delete

The reason for the failure is that
thd->mdl_context.release_transactional_locks()
was called after commit & rollback even in cases where the current
transaction is still active.

For 10.2, 10.3 and 10.4 the fix is simple:
- Replace all calls to thd->mdl_context.release_transactional_locks() with
  thd->release_transactional_locks(). The thd function will only call
  the mdl_context function if there are no active transactional locks.
  In 10.6 we will better fix where we will change the return value for
  some trans_xxx() functions to indicate if transaction did close the
  transaction or not. This will avoid the need of the indirect call.

Other things:
- trans_xa_commit() and trans_xa_rollback() will automatically
  call release_transactional_locks() if the transaction is closed.
- We can't do that for the other functions as the caller of many of these
  are doing additional work (like close_thread_tables) before calling
  release_transactional_locks().
- Added missing abort_result_set() and missing DBUG_RETURN in
  select_create::send_eof()
- Fixed wrong indentation in injector::transaction::commit()

mysql-test/suite/innodb/r/foreign_key.result

@@ -413,6 +413,7 @@ CREATE TABLE x AS SELECT * FROM t1;
 ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  ACTIVE state
 connect  con1,localhost,root,,test;
 SET foreign_key_checks= OFF, innodb_lock_wait_timeout= 1;
+SET lock_wait_timeout=5;
 ALTER TABLE t1 ADD FOREIGN KEY f (a) REFERENCES t1 (pk), LOCK=EXCLUSIVE;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 disconnect con1;

mysql-test/suite/innodb/t/foreign_key.test

@@ -414,6 +414,7 @@ INSERT INTO t1 VALUES (1,2);
 CREATE TABLE x AS SELECT * FROM t1;
 --connect (con1,localhost,root,,test)
 SET foreign_key_checks= OFF, innodb_lock_wait_timeout= 1;
+SET lock_wait_timeout=5;
 --error ER_LOCK_WAIT_TIMEOUT
 ALTER TABLE t1 ADD FOREIGN KEY f (a) REFERENCES t1 (pk), LOCK=EXCLUSIVE;# Cleanup
 --disconnect con1