Bug 1074579 - Runner should purge unused config files. r=dustin
Bug 1066823 - remove old code that supports tegras in buildbot-configs/buildbotcustom/tools/mozharness/puppet r=Callek
Bug 1066823 - remove old code that supports tegras in buildbot-configs/buildbotcustom/tools/mozharness/puppet r=Callek
Bug 1065184: upgrade to puppet-3.7.0, facter-2.2.0; r=bhearsum

This upgrade is completely smooth on all tested systems.