update swarm to 0.1.0-rc4

Signed-off-by: Victor Vieux <[email protected]>

library/swarm

@@ -1,5 +1,5 @@
 # maintainer: Andrea Luzzardi <[email protected]> (@aluzzardi)
 # maintainer: Victor Vieux <[email protected]> (@vieux)
 
-0.1.0-rc3: git://github.com/docker/swarm-library-image@c0f8204b2a1bb34233cd2144df51a4de9572440c
-latest: git://github.com/docker/swarm-library-image@c0f8204b2a1bb34233cd2144df51a4de9572440c
+0.1.0-rc4: git://github.com/docker/swarm-library-image@6e5a1152e110fcd990d53e093b6881696e61525f
+latest: git://github.com/docker/swarm-library-image@6e5a1152e110fcd990d53e093b6881696e61525f