Add additional explicit imports of _ where needed

It appears that I missed some of the needed explicit
imports of _.  I have now run through all the /bin/cinder-*
functions and ensured that they can be properly started.

This patch adds additional imports of _ and also changes
cinder-rtstool to use the 'cinder' domain as was suggested by
Duncan Thomas in the first review cycle.

Change-Id: I6477093cb817b5b9506dd3787f027e073c51f37d
Closes-Bug:  1345789

bin/cinder-all

@@ -49,6 +49,7 @@ gettextutils.enable_lazy()
 
 # Need to register global_opts
 from cinder.common import config   # noqa
+from cinder.openstack.common.gettextutils import _
 from cinder.openstack.common import log as logging
 from cinder import service
 from cinder import utils

bin/cinder-manage

@@ -80,6 +80,7 @@ from cinder.common import config  # noqa
 from cinder import context
 from cinder import db
 from cinder.db import migration
+from cinder.openstack.common.gettextutils import _
 from cinder.openstack.common import log as logging
 from cinder.openstack.common import uuidutils
 from cinder import rpc

bin/cinder-rtstool

@@ -16,13 +16,15 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
-import gettext
 import sys
 
 import rtslib
 
-gettext.install('cinder-rtstool', unicode=1)
-gettext.enable_lazy()
+from cinder.openstack.common import gettextutils
+from cinder.openstack.common.gettextutils import _
+
+gettextutils.install('cinder')
+gettextutils.enable_lazy()
 
 
 class RtstoolError(Exception):

bin/cinder-volume-usage-audit

@@ -57,6 +57,7 @@ gettextutils.enable_lazy()
 
 from cinder import context
 from cinder import db
+from cinder.openstack.common.gettextutils import _
 from cinder.openstack.common import log as logging
 from cinder import rpc
 from cinder import utils