Virtualization/LXC: use utsname instead of container name

[mayasd]

This change responds to a problem with container name created in Proxmox.

In fact an ID is use in Promox to named LXC container.

For example:

lxc-ls -f
NAME STATE   AUTOSTART GROUPS IPV4         IPV6               UNPRIVILEGED 
100  RUNNING 0         -      XX.XX.XX.XX  XXXX:XXXX:XXX:XXXX false
101  RUNNING 0         -      XX.XX.XX.XX  XXXX:XXXX:XXX:XXXX false
106  RUNNING 0         -      XX.XX.XX.XX  XXXX:XXXX:XXX:XXXX false
108  RUNNING 0         -      XX.XX.XX.XX  XXXX:XXXX:XXX:XXXX false
113  RUNNING 0         -      XX.XX.XX.XX  XXXX:XXXX:XXX:XXXX false

With ID instead of hostname we are unable to know which server it is in GLPI.

Proxmox preserve utsname in containers configuration file so if you are ok I think we can used utsname parameter if it's exist instead of container name displayed in lxc-ls command.

[g-bougard]

Interesting feature, good job.
I only have one suggestion, check it and tell us what you think.
You'll probably have to fix test if you decide to follow it.

[mayasd]

Hi,
Do you have any update about this PR ?
Thank you