Merge pull request #3133 from nishanttotla/update_swarm_v1.2.7

Update swarm v1.2.7

library/swarm

@@ -5,5 +5,5 @@ Maintainers: Alexandre Beslic <[email protected]> (@abronan),
              Victor Vieux <[email protected]> (@vieux)
 GitRepo: https://github.com/docker/swarm-library-image.git
 
-Tags: 1.2.6, latest
-GitCommit: 3725bf97c64a9425fc609d32df907170657a6b84
+Tags: 1.2.7, latest
+GitCommit: b741365fdf375bb7409314b4a161a91290935d3f