1. Added a new API for a connected auto-fill service to
disable itself
2. Added a new shell command to destroy all pending sessions
which is used in CTS tests
3. Fixed a bug where the unbind timeout was in minutes
instead of seconds
Test: wrote CTS tests, all auto-fill tests pass
bug:35848030
Change-Id: I681605aa0b8c004a0f14e30b57117c291d89a894