Added missing support for resource states in unicode format in VM workload consolidation strategy

Unicode type resource state is now handled in the same fashion as resource state specified by general string.

Change-Id: I35ffa09015283b51c935515436735aecbe83a9d6
Closes-Bug: #1565764

watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py

@@ -20,6 +20,7 @@
 from copy import deepcopy
 
 from oslo_log import log
+import six
 
 from watcher._i18n import _LE, _LI
 from watcher.common import exception
@@ -95,7 +96,7 @@ class VMWorkloadConsolidation(base.BaseStrategy):
 
         :param state: resource state of unknown type
         """
-        if type(state) == str:
+        if isinstance(state, six.string_types):
             return state
         elif (type(state) == hyper_state.HypervisorState or
               type(state) == vm_state.VMState):