Bug 938207 - [Dialer] Intermittent Travis Unit Test Failure: dialer/call...

..._log_db Two calls, same group, different hour Add a call: Error: timeout of 2000ms exceeded r=etienne

* increase the timeout for the call_log_db tests because we're using an
  asynchronous IndexedDB API and we really want to use it even in the tests
* rename calllog_db_test to call_log_db_test so that the tests will be run when
  saving call_log_db.js