Merge remote-tracking branch 'haus/ticket/2.7rc/14297_handle_upstart_better' into 2.7rc

• haus/ticket/2.7rc/14297_handle_upstart_better: (#14297) Don't remove tty1 or rsyslog during upstart acceptance (#14297) Define agent in upstart acceptance test (#14297) Update upstart provider acceptance tests (#14297) Clean up upstart provider and tests (#14297) Add acceptance test for upstart provider (#14297) Update spec tests for upstart provider (#14297) Handle upstart services better