[18.03] vndr swarmkit to 49a9d7f

[andrewhsu]

brings in the following changes:

• scheduler: Adding plugin filter unit test for bind mount moby/swarmkit#2432 scheduler: Adding plugin filter unit test for bind mount
• Redact registry auth token from swarm-rafttool moby/swarmkit#2501 Redact registry auth token from swarm-rafttool
• Revert "[manager/dispatcher] Synchronize Dispatcher.Stop() with incoming rpcs." moby/swarmkit#2518 Revert "[manager/dispatcher] Synchronize Dispatcher.Stop() with incoming rpcs."
• [manager/dispatcher] Synchronize Dispatcher.Stop() with incoming rpcs. moby/swarmkit#2519 [manager/dispatcher] Synchronize Dispatcher.Stop() with incoming rpcs.

vndr engine:

$ cd components/engine
$ vi vendor.conf
$ make BIND_DIR=. shell
$ vndr github.com/docker/swarmkit

vndr cli:

$ cd components/cli
$ vi vendor.conf
$ make -f docker.Makefile shell
$ vndr github.com/docker/swarmkit

comparison of upstream changes: moby/swarmkit@f74983e...49a9d7f

[thaJeztah]

This includes the changes from moby/moby#36371

[thaJeztah]

Opened #453 (based on top of this PR) to also bring in moby/swarmkit#2523