Silvin Lubecki ba693dc4c7 Fix help message flags on docker stack commands and sub-commands
PersistentPreRunE needs to be called within the help function to initialize all the flags (notably the orchestrator flag)
Add an e2e test as regression test

Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>
Upstream-commit: 21cce52b30
Component: cli
2018-08-01 01:48:27 +02:00
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