Merge back test_http_implementations.pc into test_http.py.
* bzrlib/tests/test_http.py: Merge test_http_implementations.py now that we have rewritten load_tests. That should reduce the noise in the final proposed patch.
* bzrlib/tests/http_server.py: (TestingHTTPRequestHandler.log_message): Ghaaa, don't over spell-check.