Add pg_createcluster creating process for psql version after 9.3
Add pg_createcluster creating process for psql version after 9.3

postgresql 9.3 don't create /etc/postgresql and related conf file by
default. So we need start the pg_createcluster in devstack if has not
started after package installed.

Change-Id: I2b348658d79b23b5f21871b33d8023499b2fb956
Close-bug: #1552051

Mahito/devstack,samgoon/devstack,noironetworks/devstack,group-policy/devstack,richliu/devstack,dtroyer/devstack,group-policy/devstack,nawawi/openstack,samgoon/devstack,openstack-dev/devstack,openstack-dev/devstack,noironetworks/devstack,nawawi/openstack,bigswitch/devstack,Mahito/devstack,bigswitch/devstack,bswartz/devstack,bswartz/devstack,dtroyer/devstack,richliu/devstack