Fix 1.1 related bugs in HTTP server, add HTTPS passing tests (by temporarily disabling pycurl certificate verification).

* doc/developers/authentication-ring.txt
(verify_certificates): Fix typo, obviously only apply to HTTPS 

* bzrlib/transport/http/ca_bundle.py:
(get_ca_path): Fix too long lines.

* bzrlib/transport/http/_pycurl.py:
(CURLE_SSL_CACERT): New error code.
(PyCurlTransport._set_curl_options): Temporarily disable peer
verification to make tests pass.
(PyCurlTransport._curl_perform): Catch CURLE_SSL_CACERT as a
connection error.
(get_test_permutations): Add HTTPS tests.

* bzrlib/tests/https_server.py:
(TestingHTTPSServer, TestingThreadingHTTPSServer): HTTPS test
servers.
(HTTPSServer_PyCurl): New class for pycurl HTTPS test server.

* bzrlib/tests/http_server.py:
(TestingHTTPRequestHandler.send_error): Overrides python version
since we need to specify a Content-Length.
(TestingHTTPRequestHandler.get_multiple_ranges): Sabotage !
Off-by-one error caused a buggy comment ! Went unnoticed until
pycurl+https hang.
(HttpServer.create_httpd): Allow server creation overriding.