Add a new countdown latch to ensure telephony unbinds

1) After each test, ensure that AOSP has unbound before continuing.
2) Enhance logging and fix some logging typos

Bug: 197991451

Test: atest CtsTelephonyTestCases:ImsServiceTest
Change-Id: I2ea68d615c38dae08fb30fff324aa1d2bbb0114c
Merged-In: I2ea68d615c38dae08fb30fff324aa1d2bbb0114c
5 files changed