Change default import group from com.google to org.torproject. ([diff](https://trac.torproject.org/projects/tor/wiki/org/teams/MetricsTeam/MetricsJavaStyleGuide?action=diff&version=15)) URL: https://trac.torproject.org/projects/tor/wiki/org/teams/MetricsTeam/MetricsJavaStyleGuide?version=15