Wip: multiple tags in lumberjack
turn app/class tag variables in to arrays
Merge branch 'logstash_backdrop' of github.com:alphagov/pp-puppet into logstash_backdrop

* 'logstash_backdrop' of github.com:alphagov/pp-puppet:
  Lint
  Fix more syntax
  Fix puppet syntax
  Moving lumberjack config to pp:app

Conflicts:
	hieradata/role-backend-app.yaml