check mariadb galera status in every loop.
check mariadb galera status in every loop.

in extend_start.sh, if Mariadb galera is not ready at first time, it will sleep 60s and then exit 1.
we should check it`s status every time in the loop.

Change-Id: I89174969687eecbf467ca3cad9aad1bfbfb8c4fe
Closes-Bug: #1676316

intel-onp/kolla,rahulunair/kolla,intel-onp/kolla,coolsvap/kolla,GalenMa/kolla,openstack/kolla,nihilifer/kolla,stackforge/kolla,stackforge/kolla,stackforge/kolla,mrangana/kolla,GalenMa/kolla,coolsvap/kolla,openstack/kolla,coolsvap/kolla,mrangana/kolla,nihilifer/kolla,rahulunair/kolla