fedrepo-req, the new CLI tool for requesting dist-git repos and branches, requires a pagure identification token in order to work.

This seems a bit unfortunate to me, especially we recently switched over to Kerberos authentication for other parts of Fedora. I can kinit and then submit builds to koji; it is a little annoying to need an entirely separate authentication token from pagure in order to request packages and branches. The annoyance is then further compounded by the fact that the pagure auth token needs to be renewed every couple of months; it just adds another thing that a packager needs to keep track of.

Therefore, if it were possible to use kerberos to auth to pagure (or to the pagure API?), it would be extremely convenient.

(See also #84 on fedrepo_req, which I filed before being told to bring this here).