This patch removes the convert_data function which has been introduced
with the first one and deprecated Command Line Interface. The
--validation and --group arguments were sending comma-separated strings
instead of list. The new Command Line Interface is now enforcing this by
using its own CommaList Parser Action and only accepting List of groups
or validation names.
This function is now useless and can be removed safely. Tests and usages
have been modified accordingly.
Change-Id: Ief9459e914ea73fbd59a85c07a55c26078e0126a
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>