Merge pull request #2543 from dongluochen/update_swarm_v1.2.6

update swarm v1.2.6

library/swarm

@@ -5,8 +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-rc2
-GitCommit: e8268874ec7b6af365cf6a90e02ad3af89c82830
-
-Tags: 1.2.5, latest
-GitCommit: 67e6cf4171fcabd2e3b8b809105e7dfb15114ce1
+Tags: 1.2.6, latest
+GitCommit: 3725bf97c64a9425fc609d32df907170657a6b84