Add back client module

The removal of the Client module breaks downstream consumers such as
heat. This patch adds it back.

Change-Id: I422bd6e9ab0cbb985380f1b898435344f1dd8ac9

senlinclient/client.py

@@ -0,0 +1,23 @@
+# 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 senlinclient.common import utils
+
+
+def Client(api_ver, *args, **kwargs):
+    """Import versioned client module.
+
+    :param api_ver: API version required.
+    """
+    module = utils.import_versioned_module(api_ver, 'client')
+    cls = getattr(module, 'Client')
+    return cls(*args, **kwargs)

senlinclient/common/utils.py

@@ -15,6 +15,7 @@ from __future__ import print_function
 
 from heatclient.common import template_utils
 from oslo_serialization import jsonutils
+from oslo_utils import importutils
 import prettytable
 import six
 import yaml
@@ -23,6 +24,13 @@ from senlinclient.common import exc
 from senlinclient.common.i18n import _
 
 
+def import_versioned_module(version, submodule=None):
+    module = 'senlinclient.v%s' % version
+    if submodule:
+        module = '.'.join((module, submodule))
+        return importutils.import_module(module)
+
+
 def format_nested_dict(d, fields, column_names):
     if d is None:
         return ''