NLP Combo feature : screen network locations

***This is just the missing part***

If Combo Provider is listening for network
locations, it will want to screen these locations
before they are sent out to clients.

CRs-fixed: 483398

Change-Id: I3156e85307b40aee9fb06b433c83153c84b8ed42
(cherry picked from commit ddbb57088ac245defa661d377408cb6985e67562)
(cherry picked from commit 53c26d1255ffca867e9446e1f4fd5b9e8cfdb7d0)
(cherry picked from commit ad1c7fe0b66211fcb0749de434a6a939d1bc1978)