Integration of Ceilometer in Watcher

In current implementation is not easy to use ceilometer.
Watcher must query metrics from the Telemetry v2 API to allow an easiest integration with OpenStack components (especially devstack).

blueprint telemetry-integration
Change-Id: Ide515472f1d160925d9f4aabf48c96dea4f6bc05

watcher/cmd/decisionengine.py

@@ -23,11 +23,11 @@ import sys
 
 from oslo_config import cfg
 from oslo_log import log as logging
+from watcher.decision_engine.framework.manager import DecisionEngineManager
 
-from watcher.decision_engine.framework.manager_decision_engine import \
-    DecisionEngineManager
 from watcher import i18n
 
+
 LOG = logging.getLogger(__name__)
 CONF = cfg.CONF
 _LI = i18n._LI