Instead of /etc/isimage. Choice as been made to not enforce version
here as there are no needs to do so.

Define a decorator for libvirt handlers, those can be used only when the
connection to the libvirt is active

With the permission of Romain Degez, CTO of Smartjog.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

command not found/command doesn't have executable permission

Tunnel endpoints are now automaticaly closed by default.