Description of problem:
When a stateless VM is started and then stopped the NIC associated with this VM is automatically unplugged if there is another VM with NIC with the same MAC address. This happens even if the DC has a MAC pool which allows duplicate MAC.

Version-Release number of selected component (if applicable):
RHV 4.0.4

How reproducible:
100%

Steps to Reproduce:
1. Configure new MAC address range and allow the allow duplicate MACs
2. Create two VMs and mark one as stateless
3. Assign one NIC to each of the VMs and set the same MAC addresses
4. Start the stateless VM
5. Stop the stateless VM

Actual results:
Network Interface eth1 has MAC address xx.xx.xx.xx.xx.xx which is in use, therefore it is being unplugged from VM xxxxx.

Expected results:
The network interface is not unplugged if the mac address range allows duplicates.

Additional info:
This behaviour does not happen with VMs which are not stateless.