Make the Zone object py3 compatible

This fixes the tests for the pool manager by making the Zone class
hashable, so that it can be used in sets.

Change-Id: Ief72a0787aa91f3e4e2b599bd0d573ac0eb9e881

designate/objects/zone.py

@@ -188,6 +188,9 @@ class Zone(base.DictObjectMixin, base.SoftDeleteObjectMixin,
                 "Provided object does not match "
                 "schema", errors=errors, object=self)
 
+    def __hash__(self):
+        return hash(self.id)
+
     def validate(self):
         errors = ValidationErrorList()
 

tests-py3.txt

@@ -1,5 +1,4 @@
 # Blacklist of tests failing on Python 3
-designate.tests.test_pool_manager.test_service
 designate.tests.unit.test_central.test_basic
 designate.tests.unit.test_pool
 designate.tests.unit.test_producer.test_tasks