[PRQ#50327] Deletion Request for python-gabbi

MarsSeed [1] filed a deletion request for python-gabbi [2]: Cleanup of unmaintained, broken package. See openstack-placement's deletion request PRQ#48982 for the details on why it doesn't make sense to keep these abandoned server components on AUR. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python-gabbi/