Use a single configuration file for specifying docker containers.

This removes the default container names from all the templates
and uses a single environment file to specify the full container
name and registry from which to pull.  Also does away with most
of DockerNamespace.

Change-Id: Ieaedac33f0a25a352ab432cdb00b5c888be4ba27
Depends-On: Ibc108871ebc2beb1baae437105b2da1d0123ba60
Co-Authored-By: Dan Prince <dprince@redhat.com>
Co-Authored-By: Steve Baker <sbaker@redhat.com>

docker/services/ceilometer-agent-central.yaml

@@ -4,17 +4,11 @@ description: >
   OpenStack containerized Ceilometer Agent Central service
 
 parameters:
-  DockerNamespace:
-    description: namespace
-    default: 'tripleoupstream'
-    type: string
   DockerCeilometerCentralImage:
     description: image
-    default: 'centos-binary-ceilometer-central:latest'
     type: string
   DockerCeilometerConfigImage:
     description: The container image to use for the ceilometer config_volume
-    default: 'centos-binary-ceilometer-central:latest'
     type: string
   EndpointMap:
     default: {}
@@ -67,10 +61,7 @@ outputs:
         config_volume: ceilometer
         puppet_tags: ceilometer_config
         step_config: *step_config
-        config_image:
-          list_join:
-            - '/'
-            - [ {get_param: DockerNamespace}, {get_param: DockerCeilometerConfigImage} ]
+        config_image: {get_param: DockerCeilometerConfigImage}
       kolla_config:
         /var/lib/kolla/config_files/ceilometer_agent_central.json:
           command: /usr/bin/ceilometer-polling --polling-namespaces central
@@ -83,10 +74,7 @@ outputs:
         step_3:
           ceilometer_init_log:
             start_order: 0
-            image: &ceilometer_agent_central_image
-              list_join:
-                - '/'
-                - [ {get_param: DockerNamespace}, {get_param: DockerCeilometerCentralImage} ]
+            image: &ceilometer_agent_central_image {get_param: DockerCeilometerCentralImage}
             user: root
             command: ['/bin/bash', '-c', 'chown -R ceilometer:ceilometer /var/log/ceilometer']
             volumes: