Remove graduated gettextutils from openstack/common

Use oslo.i18n package and handle different versions properly in
glanceclient._i18n. The oslo namespace is being deprecated so imports
will be oslo_i18n going forward. For older versions of oslo.i18n though,
we will still be able to import i18n from oslo.

Change-Id: Id56d34ccf447dc6f7becafb74d6a30e8a1642030

glanceclient/shell.py

@@ -34,9 +34,9 @@ from oslo.utils import importutils
 import six.moves.urllib.parse as urlparse
 
 import glanceclient
+from glanceclient import _i18n
 from glanceclient.common import utils
 from glanceclient import exc
-from glanceclient.openstack.common.gettextutils import _
 
 from keystoneclient.auth.identity import v2 as v2_auth
 from keystoneclient.auth.identity import v3 as v3_auth
@@ -45,6 +45,7 @@ from keystoneclient.openstack.common.apiclient import exceptions as ks_exc
 from keystoneclient import session
 
 osprofiler_profiler = importutils.try_import("osprofiler.profiler")
+_ = _i18n._
 
 
 class OpenStackImagesShell(object):