Description of problem:
Adding secondary network interface to a running VM and then migrate the VM, the 2nd NIC is not presenting in VM

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

How reproducible:

Steps to Reproduce:
1. Configure NNCP on all nodes
2. Create NAD with the bridge
3. Create a VM and get it running
4. Enable the network hotplug feature
5. Add 2nd NIC to the VM
6. Migrate the VM
7. Check the VM guest after the VM migration complete

Actual results:
2nd NIC is not presenting in VMI spec and the guest

Expected results:
2nd NIC is presenting in VM guest

Additional info:
Originally reported in https://bugzilla.redhat.com/show_bug.cgi?id=2237408