Use Received Uri as Gateway Uri

Gateway information is the core component to perform redirection.
We should clarify the uri we received from
 CallRedirectionService is gateway Uri. And apply it in Telecom.

Test: Manual; Treehugger
Bug: 130048865
Change-Id: Ie7b16411e6d26c88e990009733a9f5a0514d4902
Merged-In: Ie7b16411e6d26c88e990009733a9f5a0514d4902