Expose parameter MistralDockerGroup

This will be set to true for undercloud deployments

Change-Id: I4e34a930d384ae4220070e3b613477b9ff89314c
Blueprint: container-prepare-workflow

environments/docker-uc-light.yaml

@@ -30,3 +30,4 @@ resource_registry:
 parameter_defaults:
   ZaqarMessageStore: 'swift'
   ZaqarManagementStore: 'sqlalchemy'
+  MistralDockerGroup: true

environments/undercloud.yaml

@@ -100,3 +100,4 @@ parameter_defaults:
       DhcpRangeStart: '192.168.24.5'
       DhcpRangeEnd: '192.168.24.24'
   UndercloudCtlplaneLocalSubnet: 'ctlplane-subnet'
+  MistralDockerGroup: true

puppet/services/mistral-base.yaml

@@ -45,6 +45,10 @@ parameters:
     description: The password for the Mistral service and db account, used by the Mistral services.
     type: string
     hidden: true
+  MistralDockerGroup:
+    default: false
+    description: Add the mistral user to the docker group to allow actions to perform docker operations.
+    type: boolean
   KeystoneRegion:
     type: string
     default: 'regionOne'
@@ -117,6 +121,7 @@ outputs:
           - ''
           - - {get_param: [EndpointMap, KeystoneV3Internal, uri]}
             - '/ec2tokens'
+        tripleo::profile::base::mistral::executor::docker_group: {get_param: MistralDockerGroup}
       service_config_settings:
         keystone:
           mistral::keystone::auth::tenant: 'service'