Description of problem:

Renaming a NIC causes a new one to be created and the old one is not deleted, so the VM gets an extra NIC.

Version-Release number of selected component (if applicable):
4.12.2

How reproducible:
Always

Steps to Reproduce:
1. Go to Virtualization -> Virtual Machines -> VM XYZ -> Network Interfaces
2. Pick a NIC from the list and click Edit
3. Write a new name at the top and click Save.

Actual results:

• A new NIC is created with the new name
• VM may fail to start because of duplicate MAC

Expected results:

• No duplicate NIC, single existing NIC with new name.

Additional info:

• VM may fail to start because of duplicate MAC due to duplicate NIC.

admission webhook "mutatevirtualmachines.kubemacpool.io" denied the request: Failed to update virtual machine allocation error: failed to allocate requested mac address