Undeprecate and retain GeoIP support by switching from net/GeoIP
to net/libmaxminddb. Update pkg-message to document updating via
net/geoipupdate. Remove pkg-descr whitespace flagged by portlint.

PR: 234950
Reviewed by: ler (mentor)
Approved by: freebsd@dns.company (maintainer), ler (mentor)
Differential Revision: https://reviews.freebsd.org/D19173