Check varnish backend health

How to run the script: ``` usage: check_varnish_health [-h] path args ./check_backend_health.py [varnishadm path] [backend cmd (backend.list)] ``` Example Nagios Configuration: ``` command[check_backend_health]=/usr/lib/nagios/plugins/check_backend_health.py /usr/bin/varnishadm backend.list…