Stop redirect loops

[avtobiff]

Stop redirects if the server path equals redirect path. This stops redirect loops.

[vinoski]

Looks like redirect_with_trailing_slash is failing.

Can we also add a new test for redirect loops?

[avtobiff]

Yes, I mixed up Prefix and Path when creating this change. Should be fixed in last push.

Wlil work on a test.

[avtobiff]

Finally using the correct path (the (#arg.req)#http_request.path), but the redirect is still failing. Needs more work.