Don't mount docker.sock in the mistral-executor container

Once the python uploader is the default there will be no docker
operations performed during container image prepare.

Change-Id: Id7c9f54b0d4c550a5675ec7deecb3d521133418d

deployment/mistral/mistral-executor-container-puppet.yaml

@@ -197,10 +197,6 @@ outputs:
                         '/home/tripleo-admin:/home/tripleo-admin'
                       params:
                         tripleo-admin: {get_param: TripleoAdminUser}
-                - if:
-                  - docker_enabled
-                  - - /var/run/docker.sock:/var/run/docker.sock:rw
-                  - null
             environment:
               - KOLLA_CONFIG_STRATEGY=COPY_ALWAYS
       host_prep_tasks: