In certain use cases, you may be listening on a different interface
and it is not possible to listen to multiple interfaces with MySQL.
This changes the behaviour to connect via the local socket, as
Galera treats 'localhost' as a connection via the UNIX socket and
'127.0.0.1' as using the TCP socket.
This will allow using Galera on a specific interface while still
letting the bootstrap process talk to the local machine via the
socket which is still available.
Change-Id: Ib46f91e0a6becc934984d372bc51fc2aa77a0c95
ef6f6d7782