Check for duplicate MAC addresses.
Check for duplicate MAC addresses.

This patch gets all MAC addresses assigned
to the VMs on the host and verifies that the
generated or passed MAC does not conflict with
an existing MAC.

Signed-off-by: Sharad Mishra <d58fa9fec7d2950b3161493979eb26c14df9e956@us.ibm.com>

libvirt/libvirt-cim,libvirt/libvirt-cim,libvirt/libvirt-cim