Modprobe filesystem modules before checking support.

This bug was accidentially introduced in commit ec9bd07 which removed
unionfs-fuse support.

components/9990-overlay.sh

@@ -8,13 +8,13 @@ setup_unionfs ()
 	rootmnt="${2}"
 	addimage_directory="${3}"
 
+	modprobe -q -b ${UNIONTYPE}
+
 	if ! cut -f2 /proc/filesystems | grep -q "^${UNIONTYPE}\$"
 	then
 		panic "${UNIONTYPE} not available."
 	fi
 
-	modprobe -q -b ${UNIONTYPE}
-
 	# run-init can't deal with images in a subdir, but we're going to
 	# move all of these away before it runs anyway.  No, we're not,
 	# put them in / since move-mounting them into / breaks mono and