Update translation setup

Follow new infra setup for translations, see spec
http://specs.openstack.org/openstack-infra/infra-specs/specs/translation_setup.html
for full details.

This basically renames
python-openstackclient/locale/python-openstackclient.pot to
openstackclient/locale/openstackclient.pot. For this we need to update
setup.cfg.

Update also domain name in i18n.py.

Change-Id: I89fad12f20775c8b7cd228348ff82a77488e6ab2

openstackclient/i18n.py

@@ -15,7 +15,7 @@
 
 import oslo_i18n
 
-_translators = oslo_i18n.TranslatorFactory(domain='python-openstackclient')
+_translators = oslo_i18n.TranslatorFactory(domain='openstackclient')
 
 # The primary translation function using the well-known name "_"
 _ = _translators.primary

setup.cfg

@@ -447,13 +447,13 @@ universal = 1
 [extract_messages]
 keywords = _ gettext ngettext l_ lazy_gettext
 mapping_file = babel.cfg
-output_file = python-openstackclient/locale/python-openstackclient.pot
+output_file = openstackclient/locale/openstackclient.pot
 
 [update_catalog]
-domain = python-openstackclient
-output_dir = python-openstackclient/locale
-input_file = python-openstackclient/locale/python-openstackclient.pot
+domain = openstackclient
+output_dir = openstackclient/locale
+input_file = openstackclient/locale/openstackclient.pot
 
 [compile_catalog]
-directory = python-openstackclient/locale
-domain = python-openstackclient
+directory = openstackclient/locale
+domain = openstackclient