This fix updates swarmkit to 5a6df4b07d83e6dbd72e39e354c325dc9b91850f. This fix is needed by #29074 (docker PR) and is related to docker/swarmkit#1789 (swarmkit PR) and #29044 This fix may be needed for 1.13. Signed-off-by: Yong Tang <yong.tang.github@outlook.com> Upstream-commit: 3c1c992271800b3ba948482d2e8c2c41d765a906 Component: engine