Make test-setup.sh compatible with mysql8
Make test-setup.sh compatible with mysql8

Starting from mysql version 8 it's not possible to create a user
implictly when using GRANT.

This patch makes the behavior compatible with that.

Change-Id: Id92a73ffc98906f30cadee98650e86d4d080653b
Co-written-by: Riccardo Pittau <2323dc6bbb92a070c101cecbbdc553b4cd368996@gmail.com>
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

openstack/manila,openstack/manila