Change namespace for Ceilometer resources and tests

Change namespace to more specified.
Use path to specify resource or test should be enough.

Change-Id: I295accc2c04c23d6df5f39a12bedfacc22691737

heat/tests/openstack/ceilometer/test_gnocchi_alarm.py

@@ -19,7 +19,8 @@ import mox
 from heat.common import exception
 from heat.common import template_format
 from heat.engine.clients.os import ceilometer
-from heat.engine.resources.openstack.ceilometer import gnocchi_alarm as gnocchi
+from heat.engine.resources.openstack.ceilometer.gnocchi import \
+    alarm as gnocchi
 from heat.engine import scheduler
 from heat.tests import common
 from heat.tests import utils