Sets the list of network interface cards that a VM will have.
Usually a VM will start with a single nic, named nic1:
nics = nic1
But a VM can have other nics. Some tests (usually network related) add other nics. One obvious example is the bonding test:
# Tests variants: - nic_bonding: install setup image_copy unattended_install.cdrom nics += ' nic2 nic3 nic4'
No other documentation currently references this configuration key.