bb163c30ef
This fix tries to address several issues raised in 28626 where
run against a non-experimental daemon may not generate correct
error message:
1. Incorrect flags were not checked against the supported features:
```
$ docker stack --nonsense
unknown flag: --nonsense
```
2. Subcommands were not checked against the supported features:
```
$ docker stack ls
Error response from daemon: This node is not a swarm manager...
```
This fix address the above mentioned issues by:
1. Add a pre-check for FlagErrorFunc
2. Recursively check if a feature is supported for cmd and its parents.
This fix fixes 28626.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 8e688f17a3
Component: cli