MySQL: fix testing with MySQL >= 5.7.9
MySQL: fix testing with MySQL >= 5.7.9

Change-Id: Ied6aeb4b8a45da1bb2ded4d1b74de3de162f4d66

sileht/gnocchi,leandroreox/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,leandroreox/gnocchi,gnocchixyz/gnocchi