Drop ceilometerclient

The ceilometer API is long removed so this client is obsolete and
no longer compatible with the requirements of other client
modules.

Change-Id: I822c7a24e52d12a7c5a16706855bf02b55d991fc

snapcraft.yaml

@@ -75,11 +75,6 @@ apps:
     plugs:
       - network
       - home
-  ceilometer:
-    command: bin/ceilometer
-    plugs:
-      - network
-      - home
   cloudkitty:
     command: bin/cloudkitty
     plugs:
@@ -159,7 +154,6 @@ parts:
       - aodhclient
       - osc-placement
       - python-barbicanclient
-      - python-ceilometerclient
       - python-cloudkittyclient
       - python-congressclient
       - python-designateclient