This patch causes the DELAYED keyword to be stripped off in the
parser, thereby making the feature unavailable. All tests of the
INSERT DELAYED operation have been deleted from MTR, many times entire
files are deleted. Also, all references to such files are removed,
such as in disabled-gtid-on.list and disabled-per-push.list.

Nothing is done to the deprecated system variables pertaining to
INSERT DELAYED, i.e. manipulating them will still give a deprecation
warning.

The mutexes are not removed either and hence most performance schema
tests are intact.