Fix rbt info on Python 3.
Review Request #12520 — Created Aug. 9, 2022 and submitted — Latest diff uploaded
rbt infowas depending on a
backportsmodule, which was only
installed on Python 2.7. This prevented the command from working at all
on Python 3.
This changes the usage to be a conditional import, using the modern
version if available and falling back on the backport.
rbt infoon Python 3.