add option to manage set_process_name for qemu.conf

[igalic]

After merging the qemu changes, my config is now being overridden, and the only parameter I ever touch in (set_process_name).
Can we please add it to the list options?

And while we're at it, maybe we should think about a less painful way of adding new options.

Perhaps an options hash that's passed into the Erb would be better. That way we could have closed up, dedicated namespaces for each subsystem (qemu, Xen, whathaveyou).

[thias]

Why not... are you thinking about something like this as the default, doing the right thing?

$sasl2_libvirt = {
  'mech_list' => 'digest-md5',
  'keytab' => '/etc/libvirt/krb5.tab',
  'sasldb_path' => '/etc/libvirt/passwd.db',
}

Then inside the template, all of the recognised keys would have their value set in the right place, and all the non-recognised ones would be output at the bottom by default?

[igalic]

Not sure if we should warn or fail for non-recognized ones.
But that's the general idea, yes.