r339008 broke repquota for UFS. This rectifies that.

Refactor the function calls and tests so that, on UFS, the proper fields
are filled out.

PR: 233849
Reported by: Andre Albsmeier
Reviewed by: mav, delphij
MFC after: 1 month
Sponsored by: iXsystems Inc
Differential Revision: https://reviews.freebsd.org/D18785