Make return type from urlsplit private
Make return type from urlsplit private

The ModifiedSplitResult class should be private because when we drop
python 2.6 support we can replace the urlsplit() wrapper we have with a
reference to the one in the python standard library, which returns a
different type.

Change-Id: I413de125c58ee54a0aaaf608f57283e76283bf84

magic0704/oslo.utils,openstack/oslo.utils,varunarya10/oslo.utils