ES - Multiple build flavors use the same Google OAuth credentials

[barbeau]

Summary:

If you install more than one build flavor of OBA (e.g., obaGoogle and obaAgencyX), and then try to log in with embedded social, you get prompted to associate the login with more than one application. I believe this is due to the hard-coded value com.joulespersecond.seattlebusbot for package_name in onebusaway-android/google-services.json. This should be dynamically changed to reflect the applicationId defined in build.gradle. For example, for Agency X it should be org.agencyx.android.

Screenshot:

Related to #853, as to fully support independent ES profiles per build flavor, each build flavor also needs it's own Embedded Social API key.

Steps to reproduce:

1. Install both the obaGoogle and obaAgencyX build flavors
2. Open obaGoogle (i.e., normal) OBA app
3. Go to navigation drawer and tap "Log in"
4. Tap "Google"

Expected behavior:

Take me straight to the Google OAuth screen on behalf of the normal OBA app

Observed behavior:

It gives me the option to handle the action using either the normal OBA app or the Agency X app

Device and Android version:

Samsung Galaxy S8+ w/ Android 8.0 beta

Screenshots:

See above