Add VTS code for the network scan API

Test: Telephony sanity tests, run vts -m VtsHalRadioV1_1Target
Bug: 63531235

Cherry-picked cleanly from:
https://googleplex-android-review.git.corp.google.com/#/c/2524924/

Merged-in: I25c85b2abb738959d1445e0054049db4bb2f2dfd
Change-Id: I25c85b2abb738959d1445e0054049db4bb2f2dfd
(cherry picked from commit 2495cf5a)