Avoid POLA breakage and preserve output standard that really predates
the FreeBSD project itself. There are scripts in the wild that rely
on the behavior.
Provide option to specify -nn twice to have a completely numeric
output of the routing tables.
Fixes: 9206c79961
This reverts commit e090646d6f.
Reviewed by: zlei, gallatin, melifaro, allanjude, markj, emaste
Differential Revision: https://reviews.freebsd.org/D48729
c2aa91745e