Fixed various import issues exposed by unittest

Tried running the unit test stand-alone(e.g. using testtools.run), and
it exposed various 'import' issues about the oslo.config options and the
modules, in both the test cases themselves and the ceilometer module.
This patch fixed those import issues.

Change-Id: I68f30d335ee8d0d63c451116274632287a9ec77f
Closes-Bug: #1328796

ceilometer/alarm/evaluator/__init__.py

@@ -35,6 +35,8 @@ UNKNOWN = 'insufficient data'
 OK = 'ok'
 ALARM = 'alarm'
 
+cfg.CONF.import_group('service_credentials', 'ceilometer.service')
+
 
 @six.add_metaclass(abc.ABCMeta)
 class Evaluator(object):

ceilometer/alarm/service.py

@@ -132,9 +132,6 @@ class SingletonAlarmService(AlarmService, os_service.Service):
                                             'value': True}])
 
 
-cfg.CONF.import_opt('host', 'ceilometer.service')
-
-
 class PartitionedAlarmService(AlarmService, os_service.Service):
 
     def __init__(self):

ceilometer/messaging.py

@@ -96,6 +96,7 @@ def cleanup():
 
 def get_rpc_server(transport, topic, endpoint):
     """Return a configured oslo.messaging rpc server."""
+    cfg.CONF.import_opt('host', 'ceilometer.service')
     target = oslo.messaging.Target(server=cfg.CONF.host, topic=topic)
     serializer = RequestContextSerializer(JsonPayloadSerializer())
     return oslo.messaging.get_rpc_server(transport, target,

ceilometer/tests/alarm/partition/test_coordination.py

@@ -55,6 +55,9 @@ class TestCoordinate(tests_base.BaseTestCase):
         self.setup_messaging(self.CONF)
 
         self.test_interval = 120
+        self.CONF.import_opt('evaluation_interval',
+                             'ceilometer.alarm.service',
+                             group='alarm')
         self.CONF.set_override('evaluation_interval',
                                self.test_interval,
                                group='alarm')

ceilometer/tests/api/__init__.py

@@ -26,6 +26,7 @@ from ceilometer.tests import db as db_test_base
 
 OPT_GROUP_NAME = 'keystone_authtoken'
 cfg.CONF.import_group(OPT_GROUP_NAME, "keystoneclient.middleware.auth_token")
+cfg.CONF.import_opt("policy_file", "ceilometer.openstack.common.policy")
 
 
 class FunctionalTest(db_test_base.TestBase):

ceilometer/tests/api/v2/test_complex_query.py

@@ -17,6 +17,7 @@
 #    under the License.
 """Test the methods related to complex query."""
 import datetime
+
 import fixtures
 import jsonschema
 import mock
@@ -25,7 +26,7 @@ import wsme
 from ceilometer.alarm.storage import models as alarm_models
 from ceilometer.api.controllers import v2 as api
 from ceilometer.openstack.common import test
-from ceilometer import storage
+from ceilometer.storage import models
 
 
 class FakeComplexQuery(api.ValidatedComplexQuery):
@@ -49,7 +50,7 @@ class TestComplexQuery(test.BaseTestCase):
         super(TestComplexQuery, self).setUp()
         self.useFixture(fixtures.MonkeyPatch(
             'pecan.response', mock.MagicMock()))
-        self.query = FakeComplexQuery(storage.models.Sample,
+        self.query = FakeComplexQuery(models.Sample,
                                       sample_name_mapping,
                                       True)
         self.query_alarm = FakeComplexQuery(alarm_models.Alarm)
@@ -235,7 +236,7 @@ class TestComplexQuery(test.BaseTestCase):
 class TestFilterSyntaxValidation(test.BaseTestCase):
     def setUp(self):
         super(TestFilterSyntaxValidation, self).setUp()
-        self.query = FakeComplexQuery(storage.models.Sample,
+        self.query = FakeComplexQuery(models.Sample,
                                       sample_name_mapping,
                                       True)
 

ceilometer/tests/base.py

@@ -23,6 +23,7 @@ import six
 
 import eventlet
 import oslo.messaging
+import oslo.messaging.conffixture
 from testtools import testcase
 
 from ceilometer import messaging

ceilometer/tests/test_collector.py

@@ -43,6 +43,9 @@ class TestCollector(tests_base.BaseTestCase):
     def setUp(self):
         super(TestCollector, self).setUp()
         self.CONF = self.useFixture(config.Config()).conf
+        self.CONF.import_opt("connection",
+                             "ceilometer.openstack.common.db.options",
+                             group="database")
         self.CONF.set_override("connection", "log://", group='database')
         self.CONF.set_override('metering_secret', 'not-so-secret',
                                group='publisher')

ceilometer/tests/test_middleware.py

@@ -19,7 +19,7 @@ import mock
 
 from ceilometer import middleware
 from ceilometer.openstack.common.fixture import config
-from ceilometer.openstack.common import test
+from ceilometer.tests import base
 
 
 HTTP_REQUEST = {
@@ -68,11 +68,12 @@ HTTP_RESPONSE = {
 }
 
 
-class TestNotifications(test.BaseTestCase):
+class TestNotifications(base.BaseTestCase):
 
     def setUp(self):
         super(TestNotifications, self).setUp()
         self.CONF = self.useFixture(config.Config()).conf
+        self.setup_messaging(self.CONF)
 
     def test_process_request_notification(self):
         sample = list(middleware.HTTPRequest(mock.Mock()).process_notification(