Fix version of db to trigger update

Summary:
Request GPS updates only if dev has the GPS

Misc comments and useless stuff

Fixes T1064

Test Plan: Build

Reviewers: valerio.bozzolan

Reviewed By: valerio.bozzolan

Subscribers: valerio.bozzolan, Libre BusTO

Tags: Libre BusTO

Maniphest Tasks: T1064

Differential Revision: https://gitpull.it/D87