Correct doc string for http_conn argument
Correct doc string for http_conn argument

Previous doc string describes "http_conn" for a bunch of functions as
"HTTPConnection object" but it is actually "a tuple of (parsed_url,
HTTPConnection object)" so now this patch correct the mis-consistency.

Change-Id: I6ff90a941e6df6a1b3b5dc74fd5f4262654c9f0a

sohonetlabs/python-swiftclient,jeseem/python-swiftclient,openstack/python-swiftclient,sohonetlabs/python-swiftclient,openstack/python-swiftclient,jeseem/python-swiftclient