Issue
The bonding mode configured for "SAN bonding mode" in Compute Resource settings is not applied, MTU remains at 1500. This affects CentOS 7 KVM Compute Resources in case using user bonds in custom config, though, it works as expected with one NIC assigned to a storage network or without custom config.
Resolution
In order to overcome the issue, add the following command to a custom config before user bonding scripts:
sleep 60