Adds documentation for the cloudinit snippets support and how 'qm
cloudinit dump' can be used to get a base config file.
Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>
The header markup need to be the same length as the header itself,
else we may get an incorrect output in the following lines.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
