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/openstack/common/apiclient/base.py

@@ -40,7 +40,7 @@ Base utilities to build API operation managers and objects on top of.
 import abc
 import copy
 
-from oslo.utils import strutils
+from oslo_utils import strutils
 import six
 from six.moves.urllib import parse