WifiConnectivityManager: Unit tests for metrics

Add couple of unit-tests for metrics. Had to migrate the unit-tests to use
mock alarm manager.

BUG: 27479439
BUG: 27704599
BUG: 28480516
Change-Id: I1424053c35799905612b37edeb679e7556568ca5
TEST: Compiles & unit-test passes
2 files changed
tree: 127877f8165150d413124a7861084c0a6d728eea
  1. service/
  2. tests/