Revise client constructor

This patch revises the client.Client constructor so that other software
can invoke senlinclient in the same way as they do with other client
packages.

Change-Id: I060e2bf70d51ec381934cfd487a1a6cb44f0edd2
Closes-Bug: #1498906

senlinclient/client.py

@@ -13,7 +13,7 @@
 from senlinclient.common import utils
 
 
-def Client(api_ver, session, **kwargs):
+def Client(api_ver, *args, **kwargs):
     '''Import versioned client module.
 
     :param api_ver: API version required.
@@ -21,4 +21,4 @@ def Client(api_ver, session, **kwargs):
     '''
     module = utils.import_versioned_module(api_ver, 'client')
     cls = getattr(module, 'Client')
-    return cls(session)
+    return cls(*args, **kwargs)

senlinclient/shell.py

@@ -29,7 +29,6 @@ from senlinclient import cliargs
 from senlinclient import client as senlin_client
 from senlinclient.common import exc
 from senlinclient.common.i18n import _
-from senlinclient.common import sdk
 from senlinclient.common import utils
 
 osprofiler_profiler = importutils.try_import("osprofiler.profiler")
@@ -234,10 +233,8 @@ class SenlinShell(object):
             'token': args.token,
             'trust_id': args.trust_id,
         }
-        conn = sdk.create_connection(args.user_preferences,
-                                     USER_AGENT, **kwargs)
-
-        return senlin_client.Client('1', conn.session)
+        return senlin_client.Client('1', args.user_preferences,
+                                    USER_AGENT, **kwargs)
 
     def main(self, argv):
         # Parse args once to find version

senlinclient/v1/client.py

@@ -16,10 +16,18 @@ from openstack.identity import identity_service
 from openstack import transport as trans
 
 from senlinclient.common import exc as client_exc
+from senlinclient.common import sdk
 
 
 class Client(object):
-    def __init__(self, session):
+
+    def __init__(self, preferences, user_agent, **kwargs):
+        if 'session' in kwargs:
+            session = kwargs['session']
+        else:
+            conn = sdk.create_connection(preferences, user_agent, **kwargs)
+            session = conn.session
+
         self.session = session
         self.auth = session.authenticator