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: I10dacfe8fa425a1b1dfd4b8862a7460caa5c579f Co-written-by: Riccardo Pittau <elfosardo@gmail.com> Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>