Limit Galera SSL to TLSv1.2 ciphers
Limit Galera SSL to TLSv1.2 ciphers

When 'galera_use_ssl' is enabled, only allow TLSv1.2 supported cipher
suites.

Change-Id: Ifd2686ce64a92614b1dac5b8a5819461bf6d9d90

openstack/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server