vm/systemd: early user-configurable init script

vm-systemd/misc-post.sh

@@ -21,6 +21,7 @@ if [ -e /dev/xvdb ] ; then
 
         mkdir -p /rw/config
         touch /rw/config/rc.local
+        touch /rw/config/rc.local-early
 
         mkdir -p /rw/home
         cp -a /home.orig/user /home

vm-systemd/qubes-sysinit.sh

@@ -69,3 +69,6 @@ debug_mode=`$XS_READ qubes-debug-mode 2> /dev/null`
 if [ -n "$debug_mode" -a "$debug_mode" -gt 0 ]; then
     echo "GUI_OPTS=-vv" >> /var/run/qubes-service-environment
 fi
+
+[ -x /rw/config/rc.local-early ] && /rw/config/rc.local-early
+