How to give a group from someone to someone else in dist-git

Groups are linked to the user who created it and it used to not be possible to give the group to another user, so lots of the early groups were created under the releng user, thus allowing to easily remove the user who asked for the group if they left the project.

It is nowadays possible to give groups from an user to another. This can be done by the person who is the current main admin of the group or a pagure admin.