Fix CTS to deal with wifi-only devices.

Since this is a telephony test, it expects different behavior on
wifi-only devices. We were mistakenly identifying LTE tablets as
wifi-only because "telephony" was not present (meaning SMS+voice).

The test also is updated to handle the case where telephony services are
running on a wifi-only device.

Bug: 22793452

Change-Id: I6e190be180a98a191f5afe27b84004494ae3b7ca
1 file changed