Fixing galera cluster size = 1 restart issue.

Galera should start normaly after reboot

Change-Id: I4f1bfb0f0ba8ef4f18bc89e8cf2bc6870a2278a2

galera/files/my.cnf

 innodb_doublewrite=0
 innodb_autoinc_lock_mode=2
 innodb_locks_unsafe_for_binlog=1
+{%- if service.members|length > 1 %}
 wsrep_cluster_address="gcomm://{% for member in service.members %}{{ member.host}}:4567{% if not loop.last %},{% endif %}{% endfor %}/?pc.wait_prim=no"
+{%- else %}
+wsrep_cluster_address="gcomm://"
+{%- endif %}
 wsrep_provider={{ service.wsrep_provider }}
 wsrep_cluster_name="openstack"