Better way to ensure vn.ko is loaded.

This does not affect the kernel that vn is linked statically.

release/Makefile

@@ -191,6 +191,7 @@ rerelease release:
 	@echo "unset NOPORTS!"
 	@exit 1
 .endif
+	-vnconfig 2>/dev/null
 .if make(release)
 .if exists(${CHROOTDIR})
 # The first command will fail on a handful of files that have their schg