docker/fig — pull request #737 by chmouel (2014-12-17 13:02:11+00:00)
Title: Allow overriding user on the command line

Allow overriding a user on the command line from the one specified in
the fig.yaml

Tests are a bit tricky since regenerating a docker image with multiple
users just for this is consuming so let's catch the error instead and
make sure it works.

Signed-off-by: Chmouel Boudjnah