Switch from FLAGS to CONF in tests

Use the global CONF variable instead of FLAGS. This is purely a cleanup
since FLAGS is already just another reference to CONF.

We leave the nova.flags imports until a later cleanup commit since
removing them may cause unpredictable problems due to config options not
being registered.

Change-Id: Ic0168188dfe214fc81af04c8a9644d2d9f31600d

nova/tests/test_hypervapi.py

@@ -25,6 +25,7 @@ import sys
 import uuid
 
 from nova.compute import power_state
+from nova import config
 from nova import context
 from nova import db
 from nova import flags
@@ -40,6 +41,8 @@ from nova.virt.hyperv import driver as driver_hyperv
 from nova.virt.hyperv import vmutils
 from nova.virt import images
 
+CONF = config.CONF
+
 
 class HyperVAPITestCase(basetestcase.BaseTestCase):
     """Unit tests for Hyper-V driver calls."""
@@ -148,7 +151,7 @@ class HyperVAPITestCase(basetestcase.BaseTestCase):
 
             self._hypervutils.logout_iscsi_volume_sessions(self._volume_id)
 
-            shutil.rmtree(flags.FLAGS.instances_path, True)
+            shutil.rmtree(CONF.instances_path, True)
 
             fake_image.FakeImageService_reset()
         finally: