Revert "Big Switch: Check source_address attribute exists"

This reverts commit 0dde14c0cd.

This fix only addressed part of the problem. The socket call
in python 2.6 does not accept an extra source address arg
either.

Change-Id: I4df4f66e9db0da1a8923ee37e918718f3bcf26ee
Partial-Bug: #1316382

neutron/plugins/bigswitch/servermanager.py

@@ -566,8 +566,8 @@ class HTTPSConnectionWithValidation(httplib.HTTPSConnection):
     combined_cert = None
 
     def connect(self):
-        sock = socket.create_connection((self.host, self.port), self.timeout,
-                                        getattr(self, 'source_address', None))
+        sock = socket.create_connection((self.host, self.port),
+                                        self.timeout, self.source_address)
         if self._tunnel_host:
             self.sock = sock
             self._tunnel()