Set client module __version__

According to PEP 396, the version of client library
should be set in xxxclient.__version__, that help
python-openstackclient command "module list" to get
the right plugin module versions.

Change-Id: I74f624e75b5335c657d7bb741435bfafedcc974e
Partial-Bug: #1662058

barbicanclient/__init__.py

@@ -1 +1,22 @@
+#   Copyright 2017 Huawei, Inc. 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.
+#
+
 """Barbican Client Library Binding"""
+
+import pbr.version
+
+
+version_info = pbr.version.VersionInfo("python-barbicanclient")
+__version__ = version_info.version_string()

barbicanclient/barbican.py

@@ -32,9 +32,9 @@ from keystoneauth1 import loading
 from keystoneauth1 import session
 import six
 
+import barbicanclient
 from barbicanclient import client
 from barbicanclient._i18n import _LW
-from barbicanclient import version
 
 
 LOG = logging.getLogger(__name__)
@@ -60,7 +60,7 @@ class Barbican(app.App):
 
         super(Barbican, self).__init__(
             description=__doc__.strip(),
-            version=version.__version__,
+            version=barbicanclient.__version__,
             command_manager=commandmanager.CommandManager(
                 'openstack.key_manager.v1'),
             deferred_help=True,

barbicanclient/tests/test_base.py

@@ -1,6 +1,8 @@
 import testtools
 
+import barbicanclient
 from barbicanclient import base
+from barbicanclient import version
 
 
 class TestValidateRef(testtools.TestCase):
@@ -22,3 +24,9 @@ class TestValidateRef(testtools.TestCase):
         d3 = base.censored_copy(d1, ['payload'])
         self.assertNotEqual(d1, d3, 'd3 has redacted payload value')
         self.assertNotEqual(d3['payload'], 'my_key', 'no key in payload')
+
+    def test_module_version(self):
+        self.assertTrue(hasattr(barbicanclient, '__version__'))
+        # Test forward compatibility, please remove the case when all reference
+        # switch to barbicanclient.__version__
+        self.assertTrue(hasattr(version, '__version__'))

barbicanclient/version.py

@@ -17,7 +17,10 @@
 Cloudkeep's Barbican Client version
 """
 
-import pbr.version
+import barbicanclient
 
-version_info = pbr.version.VersionInfo("python-barbicanclient")
-__version__ = version_info.version_string()
+
+# NOTE(RuiChen): According to PEP 396, barbicanclient.version.__version__
+#                should be deprecated, please use barbicanclient.__version__
+#                instead.
+__version__ = barbicanclient.__version__