Don't print potentially verbose help messages in case of usage errors,
but print only the usage error followed by a pointer to the command's
help. This aligns with Docker.
```
$ podman run -h
flag needs an argument: -h
See 'podman run --help'.
```
Signed-off-by: Valentin Rothberg <vrothberg@suse.com>
Closes: #1379
Approved by: rhatdan