Fix broken logging imports.

This fixes all of the files incorrectly importing logging directly
and removes the workaround in hacking.py that was due to improper
from nova.openstack.common.log import logging statements.

Change-Id: Icfc25dc148c4a7b5fa7f6a7b609cd6c3d94efee1

HACKING.rst

@@ -63,7 +63,6 @@ Imports
 - imports from ``migrate`` package
 - imports from ``sqlalchemy`` package
 - imports from ``nova.db.sqlalchemy.session`` module
-- imports from ``nova.openstack.common.log.logging`` package
 - imports from ``nova.db.sqlalchemy.migration.versioning_api`` package
 
 Example::

nova/tests/test_imagecache.py

@@ -20,7 +20,6 @@ import contextlib
 import cStringIO
 import hashlib
 import json
-import logging
 import os
 import time
 
@@ -30,7 +29,7 @@ from nova.compute import vm_states
 from nova import conductor
 from nova import db
 from nova.openstack.common import importutils
-from nova.openstack.common import log
+from nova.openstack.common import log as logging
 from nova import test
 from nova import utils
 from nova.virt.libvirt import imagecache
@@ -40,7 +39,7 @@ CONF = cfg.CONF
 CONF.import_opt('compute_manager', 'nova.service')
 CONF.import_opt('host', 'nova.netconf')
 
-LOG = log.getLogger(__name__)
+LOG = logging.getLogger(__name__)
 
 
 class ImageCacheManagerTestCase(test.TestCase):
@@ -341,10 +340,10 @@ class ImageCacheManagerTestCase(test.TestCase):
     @contextlib.contextmanager
     def _intercept_log_messages(self):
         try:
-            mylog = log.getLogger('nova')
+            mylog = logging.getLogger('nova')
             stream = cStringIO.StringIO()
-            handler = logging.StreamHandler(stream)
-            handler.setFormatter(log.LegacyFormatter())
+            handler = logging.logging.StreamHandler(stream)
+            handler.setFormatter(logging.LegacyFormatter())
             mylog.logger.addHandler(handler)
             yield stream
         finally: