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: Iea53e561ab197f4ef1b4855422c748417d808fab
Partial-Bug: #1662058

tests/unit/queues/test_client.py

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import zaqarclient
 from zaqarclient import errors
 from zaqarclient.queues import client
 from zaqarclient.tests import base
@@ -32,3 +33,6 @@ class TestClient(base.TestBase):
                           client.Client,
                           'http://example.org',
                           -1, {})
+
+    def test_module_version(self):
+        self.assertTrue(hasattr(zaqarclient, '__version__'))

zaqarclient/__init__.py

@@ -0,0 +1,19 @@
+#   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.
+#
+
+from zaqarclient import version
+
+
+__version__ = version.version_string