service: Enable all tests for target
Made some changes to the test structure following the instructions
at http://go/brillo/brillo-team/testing:
- Renamed the existing host and target tests to bluetoothtbd-host_test
and bluetoothtbd_test respectively.
- The target suite now includes ALL daemon unit tests + binder tests.
- Added custom test/main.cpp to set up logging and command-line. Now
we can run tests with the -v flag to increase log verbosity level.
Bug:
24708686
Change-Id: Ia4ce5d7028ce6cb0efd4a1c51ffebdf3bbe6921e