Move cfg to nova.openstack.common

Move it here so that it can be kept in sync with openstack-common using
the new update.py script for code in openstack-common's incubation area.

See here for more details:

  http://wiki.openstack.org/CommonLibrary#Incubation

Note: this commit just moves the existing code in Nova with no other
changes. A subsequent commit will sync it with latest openstack-common
so that it is easier see the new changes.

Change-Id: If88d678b1b9bad3d37117de7f7159d7fea8ab4c8

nova/db/api.py

@@ -43,9 +43,9 @@ these objects be simple dictionaries.
 
 """
 
-from nova.common import cfg
 from nova import exception
 from nova import flags
+from nova.openstack.common import cfg
 from nova import utils
 
 

nova/db/base.py

@@ -18,9 +18,9 @@
 
 """Base class for classes that need modular database access."""
 
-from nova.common import cfg
 from nova import utils
 from nova import flags
+from nova.openstack.common import cfg
 
 
 db_driver_opt = \

nova/test.py

@@ -33,10 +33,10 @@ import mox
 import nose.plugins.skip
 import stubout
 
-from nova.common import cfg
 from nova import flags
 import nova.image.fake
 from nova import log
+from nova.openstack.common import cfg
 from nova import utils
 from nova import service
 from nova.testing.fake import rabbit

nova/utils.py

@@ -46,10 +46,10 @@ from eventlet import semaphore
 from eventlet.green import subprocess
 import netaddr
 
-from nova.common import cfg
 from nova import exception
 from nova import flags
 from nova import log as logging
+from nova.openstack.common import cfg
 
 
 LOG = logging.getLogger("nova.utils")