Android should tunnel localhost by default on emulator

[BretJohnson]

When running on an Android emulator, we should ideally map 127.0.0.1 in Aspired provided connections to 10.0.2.2.
10.0.2.2 is the special IP that the emulator uses for localhost on the host PC.
For Android physical devices a general tunneling solution, potentially DevTunnels, is needed. But for the emulator case, doing this should help.