udev. change network interface name.

To change network card name without reboot:
1) Bring the network interfaces down, then modify /etc/udev/rules.d/70-persistent-net.rules (or its equivalent)
2) re-load with udevadm control --reload-rules and finally
3) re-trigger with udevadm trigger --attr-match=subsystem=net
4) bring the network interfaces up.