Delete wrong argument from creating HTTP connection

HTTPConnection() doesn't take the argument 'context' while
HTTPSConnection() accepts it at creating a connection in an object
client. HTTP connection doesn't require an SSL context.

Change-Id: I51ffc8cd04fe90493e23b0f0ca9b0420c5a24cd5

tempest/lib/services/object_storage/object_client.py

@@ -166,7 +166,6 @@ class ObjectClient(rest_client.RestClient):
             conn = httplib.HTTPSConnection(parsed_url.netloc,
                                            context=context)
         else:
-            conn = httplib.HTTPConnection(parsed_url.netloc,
-                                          context=context)
+            conn = httplib.HTTPConnection(parsed_url.netloc)
 
         return conn