Add audit scoper for baremetal data model

Bare metal cluster data model was introduced in Queens cycle.
Since the model is different from compute data model, we
need add CDM scoper for bare metal cluster data model

Change-Id: Idd041cefb692085d4545252d229ebe8602926b58
Implements: blueprint audit-scoper-for-baremetal-data-model

watcher/decision_engine/model/collector/ironic.py

@@ -21,6 +21,7 @@ from watcher.common import ironic_helper
 from watcher.decision_engine.model.collector import base
 from watcher.decision_engine.model import element
 from watcher.decision_engine.model import model_root
+from watcher.decision_engine.scope import baremetal as baremetal_scope
 
 LOG = log.getLogger(__name__)
 
@@ -45,7 +46,9 @@ class BaremetalClusterDataModelCollector(base.BaseClusterDataModelCollector):
         return None
 
     def get_audit_scope_handler(self, audit_scope):
-        return None
+        self._audit_scope_handler = baremetal_scope.BaremetalScope(
+            audit_scope, self.config)
+        return self._audit_scope_handler
 
     def execute(self):
         """Build the baremetal cluster data model"""

watcher/decision_engine/model/collector/nova.py

@@ -193,6 +193,7 @@ class ModelBuilder(object):
     re-scheduled for Pike. In the meantime, all the associated code has been
     commented out.
     """
+
     def __init__(self, osc):
         self.osc = osc
         self.model = model_root.ModelRoot()