Remove nova.log usage from nova.rpc.

Part of blueprint common-rpc.

This patch removes the usage of nova.log from nova.rpc.  This is
necessary before nova.rpc can be moved to openstack-common.  The rpc
logging was not using any of the extra features provided in nova.log as
far as I can tell, so the changes are very simple.

This is the final dependency.  After this change, the rpc code
can be moved to openstack-common without any changes.

Change-Id: I17ca4b691bb8d4f18e618632a2381dd12d31852a

nova/rpc/amqp.py

@@ -26,6 +26,7 @@ AMQP, but is deprecated and predates this code.
 """
 
 import inspect
+import logging
 import sys
 import uuid
 
@@ -33,7 +34,6 @@ from eventlet import greenpool
 from eventlet import pools
 from eventlet import semaphore
 
-from nova import log as logging
 from nova.openstack.common import excutils
 from nova.openstack.common import local
 import nova.rpc.common as rpc_common

nova/rpc/common.py

@@ -18,10 +18,10 @@
 #    under the License.
 
 import copy
+import logging
 import sys
 import traceback
 
-from nova import log as logging
 from nova.openstack.common import cfg
 from nova.openstack.common import importutils
 from nova.openstack.common import jsonutils

nova/rpc/impl_qpid.py

@@ -18,6 +18,7 @@
 import functools
 import itertools
 import json
+import logging
 import time
 import uuid
 
@@ -26,7 +27,6 @@ import greenlet
 import qpid.messaging
 import qpid.messaging.exceptions
 
-from nova import log as logging
 from nova.openstack.common import cfg
 from nova.rpc import amqp as rpc_amqp
 from nova.rpc import common as rpc_common