Explicitly specify mysql node address

If node address is not explicitly specified, mysql galera may sometimes
use virtual IP as "source" IP when joining to cluster. It fails because this
virtual IP is not on list of IPs of cluster nodes (wsrep_cluster_address).

Change-Id: Iec08a458c747f4415a961022c56f66fe0a1f60b4
Merge "Explicitly specify mysql node address"