proxy tests: refactor tests and add cookie resolver http-only test
rename tests to test_proxy_https_cookie, test_proxy_http_cookie, test_proxy_http_auth
to allow for testing, http proxy, cookie resolver, proxy auth and https support in a more
orthogonal way
rename configs to test_config_proxy_http and test_config_proxy_https
rename test_config_proxy http and https config files to end in '_cookie' to be
clearer about the test and config correspondence