All http tests passing (including https).

* bzrlib/tests/test_server.py:
(TestingTCPServerMixin.handle_request): Override python version.

* bzrlib/tests/https_server.py:
(TestingHTTPSServerMixin.verify_request): Overriden for the ssl
handshake.
(TestingHTTPSServer, TestingThreadingHTTPSServer, HTTPSServer):
Tweaks to comply to the new implementation.

* bzrlib/tests/http_server.py:
(create_server): Fix indentation.