network: parse root=dhcp also with network-manager module

Move the logic from network-legacy to common network code.

modules.d/35network-legacy/module-setup.sh

@@ -36,7 +36,6 @@ install() {
     inst_simple -H "/etc/dhclient.conf"
     cat "$moddir/dhclient.conf" >> "${initdir}/etc/dhclient.conf"
     inst_hook pre-udev 60 "$moddir/net-genrules.sh"
-    inst_hook cmdline 91 "$moddir/dhcp-root.sh"
     inst_hook cmdline 92 "$moddir/parse-ibft.sh"
     inst_hook cmdline 95 "$moddir/parse-vlan.sh"
     inst_hook cmdline 96 "$moddir/parse-bond.sh"

modules.d/40network/module-setup.sh

@@ -28,6 +28,7 @@ install() {
     inst_script "$moddir/netroot.sh" "/sbin/netroot"
     inst_simple "$moddir/net-lib.sh" "/lib/net-lib.sh"
     inst_hook pre-udev 50 "$moddir/ifname-genrules.sh"
+    inst_hook cmdline 91 "$moddir/dhcp-root.sh"
 
     dracut_need_initqueue
 }