Cleanup tower services and exit handling
Cleanup tower services and exit handling

* Replace apache with nginx in various service scripts
* Add a failure handler that will shut down all services if any of them
  fail
* Use INT signal for uwsgi shutdown procedure

wwitzel3/awx,snahelou/awx,wwitzel3/awx,snahelou/awx,snahelou/awx,wwitzel3/awx,snahelou/awx,wwitzel3/awx