Fixes: HA , power failure of two node in a 3 node cluster fails to bring up mysql

The script will bootstrap galera once the galera cluster is down.

Change-Id: Ia7c2bab3a16c9eeef4e4f73d1a0803e16cecbcc1
ClosesBug:1378084
Merge "Fixes: HA , power failure of two node in a 3 node cluster fails to bring up mysql"