Move evaluator tests into the unit folder

The evaluator tests are not run since we split functional and unit
tests.

This change moves them into unit folder to be ran again.

Related bug: #1513738

Change-Id: Iad5018756b521c041cb25d74f1d032de6a2bf2e1

aodh/tests/unit/evaluator/test_combination.py

@@ -30,7 +30,7 @@ import pytz
 from aodh.evaluator import combination
 from aodh.storage import models
 from aodh.tests import constants
-from aodh.tests.evaluator import base
+from aodh.tests.unit.evaluator import base
 
 
 class TestEvaluate(base.TestEvaluatorBase):

aodh/tests/unit/evaluator/test_event.py

@@ -25,7 +25,7 @@ from aodh import evaluator
 from aodh.evaluator import event as event_evaluator
 from aodh.storage import models
 from aodh.tests import constants
-from aodh.tests.evaluator import base
+from aodh.tests.unit.evaluator import base
 
 
 class TestEventAlarmEvaluate(base.TestEvaluatorBase):

aodh/tests/unit/evaluator/test_gnocchi.py

@@ -28,7 +28,7 @@ from six import moves
 from aodh.evaluator import gnocchi
 from aodh.storage import models
 from aodh.tests import constants
-from aodh.tests.evaluator import base
+from aodh.tests.unit.evaluator import base
 
 
 class FakeResponse(object):

aodh/tests/unit/evaluator/test_threshold.py

@@ -30,7 +30,7 @@ from aodh.evaluator import threshold
 from aodh import messaging
 from aodh.storage import models
 from aodh.tests import constants
-from aodh.tests.evaluator import base
+from aodh.tests.unit.evaluator import base
 
 
 class TestEvaluate(base.TestEvaluatorBase):