Given that we bumped deps to fairly modern distros with the
python3 change, I think this is safe. gtk 3.22 is from sep 2016, it's
in debian9 and fedora 25+, which seems fine for our needs.
The patch adds the generic completer and validator, Further patches use
them as completer/validator. The completer won't add already specified
options to the list.
Signed-off-by: Lin Ma <lma@suse.com>
Cole Robinson