Change oslo.utils to oslo_utils

The oslo.utils libraries are moving away from namespace packages.

This requires oslo.utils>=1.2.0

bp drop-namespace-packages

Change-Id: I803df61e91eabb96329d859aef6bea03530fb84f

glanceclient/common/utils.py

@@ -24,7 +24,7 @@ import sys
 import threading
 import uuid
 
-from oslo.utils import importutils
+from oslo_utils import importutils
 import six
 
 if os.name == 'nt':
@@ -32,8 +32,8 @@ if os.name == 'nt':
 else:
     msvcrt = None
 
-from oslo.utils import encodeutils
-from oslo.utils import strutils
+from oslo_utils import encodeutils
+from oslo_utils import strutils
 import prettytable
 
 from glanceclient import exc