Support multiple default gateways from DHCP server (rhbz#1408249)

modules.d/40network/dhclient-script.sh

@@ -48,7 +48,13 @@ setup_interface() {
             # point-to-point connection => set explicit route to gateway
             echo ip route add $gw dev $netif > /tmp/net.$netif.gw
         fi
-        echo ip route replace default via $gw dev $netif >> /tmp/net.$netif.gw
+        IFS=' ' read -r main_gw other_gw <<< "$gw"
+        echo ip route replace default via $main_gw dev $netif >> /tmp/net.$netif.gw
+        if [ -n "$other_gw" ] ; then
+            for g in $other_gw; do
+                echo ip route add default via $g dev $netif >> /tmp/net.$netif.gw
+            done
+        fi
     fi
 
     if getargbool 1 rd.peerdns; then