The testcase ensures that redirects to CURLPROTO_GOPHER won't be
allowed, by default, in the future. Also, curl is being used
for convenience while keeping the testcases DRY.
The expected error code is CURLE_UNSUPPORTED_PROTOCOL when the client is
redirected to CURLPROTO_GOPHER
Signed-off-by: Linos Giannopoulos <lgian@skroutz.gr>