Fix galera stomping on boot-stack initialization

The mysql-init script mistakenly uses the same initialization singleton
file as reset-db in boot-stack. This causes the portion of reset-db
which starts the mysql service to not be run.

Change-Id: Id0949cd6e360962432e022e084433facf0dff8ab
Closes-bug: #1306596
Merge "Fix galera stomping on boot-stack initialization"