development(7): update to reflect Git transition

Approved by: re (gjb)
Reviewed By: debdrup, imp (earlier version)
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D28939

(cherry picked from commit d28cbb7944e5b1015d94a04cadc97d473838611e)
(cherry picked from commit d7ef665e10dd3bc0a6f3c0a8e928cf2fe695a113)