Add RequiredForOnline=routable to /etc/systemd/network/80-dhcp.network

By default systemd-networkd-wait-online.service considers a network
connection to be "online" when it has reached the "degraded" state
(see networkctl(1) for the definitions).

Since "degraded" does not ensure there's a routable address, let's
change the connection's requirement to "routable" instead.

images/basic.sh

@@ -17,6 +17,9 @@ function pre() {
 Name=en*
 Name=eth*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes
 EOF

images/common.sh

@@ -19,6 +19,9 @@ EOF
 Name=en*
 Name=eth*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes
 EOF