Move out of the oslo namespace package

Move the public API out of oslo.i18n to oslo_i18n. Retain the ability to
import from the old namespace package for backwards compatibility for
this release cycle.

bp/drop-namespace-packages

Change-Id: I800f121c271d8e69f6e776c4aef509bbb8008170

oslo_i18n/tests/test_locale_dir_variable.py

@@ -0,0 +1,32 @@
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslotest import base as test_base
+import testscenarios.testcase
+
+from oslo_i18n import _locale
+
+
+class LocaleDirVariableTest(testscenarios.testcase.WithScenarios,
+                            test_base.BaseTestCase):
+
+    scenarios = [
+        ('simple', {'domain': 'simple', 'expected': 'SIMPLE_LOCALEDIR'}),
+        ('with_dot', {'domain': 'one.two', 'expected': 'ONE_TWO_LOCALEDIR'}),
+        ('with_dash', {'domain': 'one-two', 'expected': 'ONE_TWO_LOCALEDIR'}),
+    ]
+
+    def test_make_variable_name(self):
+        var = _locale.get_locale_dir_variable_name(self.domain)
+        self.assertEqual(self.expected, var)