Stop any running DHCP client before bringup up an Ethernet interface

If the system server is restarted, the dhcpcd_eth0 service may have already
been started by the previous system server, and the new system server's
attempts to start the dhcpcd will do nothing.

Change-Id: Icfd480a5369eb9c7dfe86b43190294871a915529
1 file changed