Setup libvirt/kvm permissions on openSUSE

SUSE uses libvirt, similar to Debian, but manages KVM permissions
via yet another group called "kvm". It also needs a manual
udev-rules reload for applying the newly installed udev rules
in one go. On the bright side, no libvirt config modification
is necessary.

Change-Id: Icfd2d698a75e351e4c30fa7f0b17d607a56f4eb7
Merge "Setup libvirt/kvm permissions on openSUSE"