Wait for long running MySQL sync processes

Galera resyncronizing larger, and in use databases can apparently,
in some cases take a longer period of time.  This revision adds a
script to wait up to 30 minutes, and informs a user upon failure
of options to attempt should a failure occur.

Change-Id: Iec5f41aa96c09e261e7d36f18df0b4eb05bee9d5