Refactor inserting a private class between Context and Service in the hierarchy.

This is to be able to easily insert a StormService descended from _BaseService when we start
adding Storm support.

Author: Frederick Ross

splunklib/client.py

@@ -285,7 +285,10 @@ def connect(**kwargs):
     """
     return Service(**kwargs).login()
 
-class Service(Context):
+class _BaseService(Context):
+    pass
+
+class Service(_BaseService):
     """A Pythonic binding to Splunk instances.
 
     A :class:`Service` represents a binding to a Splunk instane on an
@@ -334,7 +337,7 @@ class Service(Context):
         s = client.Service(token="atg232342aa34324a")
     """
     def __init__(self, **kwargs):
-        Context.__init__(self, **kwargs)
+        super(Service, self).__init__(self, **kwargs)
         self._splunk_version = None
 
     @property