docker/docker — pull request #9792 by jfrazelle (2014-12-23 19:17:38+00:00)
Title: Return usage on parseExec error.

Closes https://github.com/docker/docker/pull/9770, different fix.

We should return usage on parseExec error because it would be that the user provided the wrong arguments.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle (github: jfrazelle)