Added core-services/98-sbin-merge scriptlet to create usr/sbin symlink.

This checks if /usr/sbin is a real directory and then moves it to
/usr/sbin.old if there are only symlinks, and then the /usr/sbin -> /usr/bin
symlink is created.

core-services/98-sbin-merge.sh

@@ -0,0 +1,11 @@
+if [ -d /usr/sbin -a ! -L /usr/sbin ]; then
+	for f in /usr/sbin/*; do
+		if [ -f $f -a ! -L $f ]; then
+			msg "Detected $f file, can't create /usr/sbin symlink."
+			return 0
+		fi
+	done
+	msg "Creating /usr/sbin -> /usr/bin symlink, moving existing to /usr/sbin.old"
+	mv /usr/sbin /usr/sbin.old
+	ln -sf bin /usr/sbin
+fi