Remove log translations

Log messages are no longer being translated. This removes all use of
the _LE, _LI, and _LW translation markers to simplify logging and to
avoid confusion with new contributions.

See:
http://lists.openstack.org/pipermail/openstack-i18n/2016-November/002574.html
http://lists.openstack.org/pipermail/openstack-dev/2017-March/113365.html

Change-Id: I3552767976807a9851af69b1fa4f86ac25943025

watcher/common/context.py

@@ -15,7 +15,6 @@ from oslo_log import log as logging
 from oslo_utils import timeutils
 import six
 
-from watcher._i18n import _LW
 from watcher.common import utils
 
 LOG = logging.getLogger(__name__)
@@ -65,7 +64,7 @@ class RequestContext(context.RequestContext):
         # safely ignore this as we don't use it.
         kwargs.pop('user_identity', None)
         if kwargs:
-            LOG.warning(_LW('Arguments dropped when creating context: %s'),
+            LOG.warning('Arguments dropped when creating context: %s',
                         str(kwargs))
 
         # FIXME(dims): user_id and project_id duplicate information that is