Replacing dhcpcd with systemd-networkd and systemd-resolved

configs/releng/airootfs/etc/udev/rules.d/81-dhcpcd.rules:
Removing the udev rule for starting dhcpcd@.service on interfaces of the
form eth* and en*.

configs/releng/airootfs/etc/systemd/network/{ethernet,wireless}.network:
Adding default DHCP configurations for en*, eth*, wlp* and wlan*
interfaces.

configs/releng/airootfs/etc/resolv.conf:
Adding a symlink from /run/systemd/resolve/stub-resolv.conf to
/etc/resolv.conf (in airootfs).

configs/releng/airootfs/root/customize_airootfs.sh:
Adding systemd-networkd and systemd-resolved to the list of services
that are being enabled during airootfs customization.

configs/releng/airootfs/etc/resolv.conf

+/run/systemd/resolve/stub-resolv.conf
\ No newline at end of file

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

+[Match]
+Name=en*
+Name=eth*
+
+[Network]
+DHCP=ipv4
+IPv6PrivacyExtensions=yes
+IPv6AcceptRA=false
+
+[DHCP]
+RouteMetric=512

configs/releng/airootfs/etc/systemd/network/wireless.network

+[Match]
+Name=wlp*
+Name=wlan*
+
+[Network]
+DHCP=ipv4
+IPv6PrivacyExtensions=yes
+IPv6AcceptRA=false
+
+[DHCP]
+RouteMetric=1024

configs/releng/airootfs/etc/udev/rules.d/81-dhcpcd.rules

-ACTION=="add", SUBSYSTEM=="net", ENV{INTERFACE}=="en*|eth*", ENV{SYSTEMD_WANTS}="dhcpcd@$name.service"

configs/releng/airootfs/root/customize_airootfs.sh

@@ -21,5 +21,5 @@ sed -i 's/#\(HandleSuspendKey=\)suspend/\1ignore/' /etc/systemd/logind.conf
 sed -i 's/#\(HandleHibernateKey=\)hibernate/\1ignore/' /etc/systemd/logind.conf
 sed -i 's/#\(HandleLidSwitch=\)suspend/\1ignore/' /etc/systemd/logind.conf
 
-systemctl enable pacman-init.service choose-mirror.service
+systemctl enable pacman-init.service choose-mirror.service systemd-networkd.service systemd-resolved.service
 systemctl set-default multi-user.target