configs/*/airootfs/etc/systemd/network/: add RequiredForOnline=routable

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.

This gives a better chance that the network really is online when
network-online.target is reached.

CHANGELOG.rst

@@ -14,6 +14,9 @@ Added
 Changed
 -------
 
+- Set ``RequiredForOnline=routable`` in systemd-networkd configuration files to improve the chances that the network
+  really is *online* when ``network-online.target`` is reached.
+
 Deprecated
 ----------
 

configs/baseline/airootfs/etc/systemd/network/20-ethernet.network

@@ -5,6 +5,9 @@
 Name=en*
 Name=eth*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes
 MulticastDNS=yes

configs/releng/airootfs/etc/systemd/network/20-ethernet.network

@@ -5,6 +5,9 @@
 Name=en*
 Name=eth*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes
 MulticastDNS=yes

configs/releng/airootfs/etc/systemd/network/20-wlan.network

@@ -1,6 +1,9 @@
 [Match]
 Name=wl*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes
 MulticastDNS=yes

configs/releng/airootfs/etc/systemd/network/20-wwan.network

@@ -1,6 +1,9 @@
 [Match]
 Name=ww*
 
+[Link]
+RequiredForOnline=routable
+
 [Network]
 DHCP=yes