Pass the postgres service host as DATABASE_SERVICE_NAME

We don't pass DATABASE_SERVICE_NAME into the manageiq pods any more

lib/embedded_ansible/container_embedded_ansible.rb

@@ -111,7 +111,7 @@ def container_environment
 
     [
       {:name => "RABBITMQ_USER_NAME",    :value => rabbit_auth.userid},
-      {:name => "DATABASE_SERVICE_NAME", :value => ENV["DATABASE_SERVICE_NAME"]},
+      {:name => "DATABASE_SERVICE_NAME", :value => ENV["POSTGRESQL_SERVICE_HOST"]},
       {:name => "POSTGRESQL_DATABASE",   :value => "awx"},
       {:name => "POSTGRESQL_USER",       :value => database_auth.userid},
       {:name      => "ANSIBLE_SECRET_KEY",