Prevent self-managed call control from TelecomManager APIs.

Prevent answerRingingCall and endCall from manipulating self-managed
calls.
Fix minor log spamming in Call.

Test: Add unit tests for new behavior change.
Bug: 173739006
Fixes: 183036796
Change-Id: I49f2ec0fb1f2007107bc0d5b24b1c541ed9a5d1b
3 files changed