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/v1/shell.py

@@ -19,8 +19,8 @@ import copy
 import functools
 import six
 
-from oslo.utils import encodeutils
-from oslo.utils import strutils
+from oslo_utils import encodeutils
+from oslo_utils import strutils
 
 from glanceclient.common import progressbar
 from glanceclient.common import utils