Error instead of nice validation message when creating host with invalid mac
Steps to reproduce:
1. Created a new host.
2. Add one interface as primary.
3. Make sure everything is valid for the host except the mac.
4. Try to save.
Validation error about the invalid mac.
The error in the attached screenshot.
This only happened for an interface that I marked as Managed, Provision.
If I check disable build mode and mark the interface just primary with nothing else I get a expected validation error.