Add unit test for RESULT_ERROR_SHORT_CODE_NEVER_ALLOWED

- add getAppPacakageName method in SmsTracker and
  refactor its usage for testability
- add isDuringSuW method and refactor its usage
  for SmsUsageMonitor for testablity

Also fix checkCallingOrSelfPermission method in ContextFixture
for this unit test and also for supporting more telephony unit
tests in the future.

Test: runtest --path frameworks/opt/telephony/tests/telephonytests/
Bug: 34773406
Bug: 65205717
Change-Id: I6dae277ced9a87b89fbb6eac22856fc73b9fdbba