Remove need to do special exception catching in parse_uri

The upstream oslo incubator code was fixed to not throw a
index error when parts of the uri are missing, so we can
remove our modification that handles these errors and just
rely on the fixed version.

Change-Id: I01c6a647858ca45aeb4685a68cb3e28b575e1e05
Merge "Remove need to do special exception catching in parse_uri"