Yong Tang c8f99f00d2 Add --file flag for docker secret create command
This fix tries to address the issue raised in 28581 and 28927
where it is not possible to create a secret from a file (only
through STDIN).

This fix add a flag `--file` to `docker secret create` so that
it is possible to create a secret from a file with:
```
docker secret create --file secret.in secret.name
```

or
```
echo TEST | docker secret create --file - secret.name
```

Related docs has been updated.

An integration test has been added to cover the changes.

This fix fixes 28581.
This fix is related to 28927.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
2017-06-02 00:10:45 +00:00
..
2017-06-02 00:10:42 +00:00
2017-06-02 00:10:44 +00:00