CHG: Updated naming variable to change based on global values
subchart_release_name for the following:
* mariadb
* rabbitmq
* memcached
This is a required change for the chart to be included
as a subchart. if subchart_release_name is not present the
yaml will render the same as prior to this change, leaving
existing deployments unaffected.
Change-Id: Ib7a449f3b21d5169b8003cf4464f3ed95e942c14
7b93d86fa6