fixup! virt-libvirt: Standardize VMXML device package module handling

Signed-off-by: Chris Evich <cevich@redhat.com>
fixup! virt-libvirt: Base classes for VMXML devices

Signed-off-by: Chris Evich <cevich@redhat.com>
fixup! virt-libvirt: Add VMXML serial device base class

Signed-off-by: Chris Evich <cevich@redhat.com>
fixup! virt-libvirt: Standardize VMXML device package module handling

Signed-off-by: Chris Evich <cevich@redhat.com>
virt-libvirt: Add xml validation method and property

Signed-off-by: Chris Evich <cevich@redhat.com>
virt-libvirt: Add device manipulation to vm_xml module

Signed-off-by: Chris Evich <cevich@redhat.com>