relevant changes:
- swarmkit#2826 [18.09 backport] use a custom grpc dialer when managers are joining (backport of swarmkit#2802)
- swarmkit#2801 [18.09 backport] Include old error-message for backward compatibility (backport of swarmkit#2797)
- swarmkit#2788 [18.09 backport] Return correct error-codes on conflicting names (backport of swarmkit#2779)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 1a60fdbdcefbecf762e063fbb5b3593e53e877bb
Component: engine
5421245401