ncm-network: trigger udev before restarting network service

[stdweird]

if mac-addresses are used in the network configuration, el7 udev rule /usr/lib/udev/rules.d/60-net.rules will assign the interface name to this devices. this way you can enforce your own/legacy naming on el7.
however when a device is added to the quattor configuration (or the mac address is changed of an existing network device), a restart of the network will not work because the rules need to be rerun.

manual fix is as simple as udevadm trigger --attr-match=subsystem=net before the restart.

still needs more testing