Remove experimental "deploy" from "dab" files

The top-level `docker deploy` command (using the "Docker Application Bundle"
(`.dab`) file format was introduced as an experimental feature in Docker 1.13 /
17.03, but superseded by support for Docker Compose files.

With no development being done on this feature, and no active use of the file
format, support for the DAB file format and the top-level `docker deploy` command
(hidden by default in 19.03), is removed in this patch, in favour of `docker stack deploy`
using compose files.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

e2e/stack/testdata/stack-deploy-help-swarm.golden

@@ -7,7 +7,6 @@ Aliases:
   deploy, up
 
 Options:
-      --bundle-file string     Path to a Distributed Application Bundle file
   -c, --compose-file strings   Path to a Compose file, or "-" to read
                                from stdin
       --orchestrator string    Orchestrator to use (swarm|kubernetes|all)