mysql: Only set certificate specs if TLS everywhere is enabled
mysql: Only set certificate specs if TLS everywhere is enabled

The conditional was missing.

Change-Id: Ie2617dd9dba1c49f37e82448b6bf229d127ed46a
Closes-Bug: #1729384

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates