Fix the smart server failing test and use it against protocol combinations.

* bzrlib/tests/test_smart_transport.py:
(HTTPTunnellingSmokeTest): Some tests transferred to
test_http (including the previously failing one).

* bzrlib/tests/test_http.py:
(SmartHTTPTunnellingTest): Transferred from test_smart_tranport
since most of the infrastucture for parametrized test is available
here and some combinations were not tested.

* bzrlib/tests/http_utils.py:
(HTTPServerWithSmarts.__init__): Add the protocol_version
parameter.