Alex Bennée d19f5fc041 docker: report hint when docker.py check fails
When a check fails we currently just report why we failed. This is not
totally helpful to people who want to boot-strap a new image. Report a
hint as to why it failed.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Suggested-by: Fam Zheng <famz@redhat.com>
2018-07-24 11:45:25 +01:00
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