[DMC-1209]: Transform redirect location relative path into full URI

[mpatrascoiu]

Would fix the problem described in DMC-1209.

It's a simple solution that addresses the problem in the top-level NeonRequest::redirectRequest(). Perhaps the problem can be solved more elegantly down the line in the StandaloneRequest implementations of both NEON or CURL.

[gbitzes]

Thanks Mihai!