add a call to a vcl_post_inuse script that if existed could be run when a reservation is ended or over. The script is to be similar to the vcl_post_load and vcl_post_reserve scripts.
Possible use case is to unregister a machine from a larger service before turning off / reloading.
Also start to relocate the default Linux locations for user added vcl_post_X scripts within the vcl image.
- Currently in /etc/init.d/ - suggested move to /usr/local/vcl
- Must be backward compatible for post_load and post_reserve