Add cdm-scoping

This patch implements cdm-scoping.
Scoping yaml file is the following:

- compute:
  - availability_zones:
    - name: nova
  - host_aggregates:
    - id: 1
    - name: agg
  - exclude:
    - compute_nodes:
      - name: w012

Change-Id: I44e00218e90c5b08b397b2a9d7fed7c195f6dc55
Partially-Implements: blueprint cdm-scoping

watcher/decision_engine/model/collector/cinder.py

@@ -37,6 +37,10 @@ class CinderClusterDataModelCollector(base.BaseClusterDataModelCollector):
     def __init__(self, config, osc=None):
         super(CinderClusterDataModelCollector, self).__init__(config, osc)
 
+    @property
+    def audit_scope_handler(self):
+        return None
+
     @property
     def notification_endpoints(self):
         """Associated notification endpoints