This option prints the list of UUIDs only.
The motivation for this option is scripting, for example:
for x in $(rally task list --status passed --uuids-only); \
do \
rally task report --tasks $x --out $x.html; \
done
Change-Id: Ia967071bc3e4454116adbc59a790ab684efff15c
Signed-off-by: Andrew McDermott <andrew.mcdermott@linaro.org>