The network interface parser of this plugin was overly specific before.
It relied on a specific format of the arguments handed over to kvm while
starting the VM. For example the following format was usable:
... -netdev tap,ifname=foo,...
But kvm/qemu support a variety of ways for configuring network
interfaces via the commandline. E.g. libvirt does not use the "ifname"
parameter above. Thus VMs running on a host controlled via libvirt
cannot be tracked with this plugin.
This limititation is now clearly documented in the header of the plugin.
The old parser seemed to rely on a simple "-name foo" argument format of
kvm/qemu. The changed parser also accepts the following formats:
* name,foo=bar,baz=bot
* guest=name,foo=bar
