Split netinet shell tests into one per line.

This makes diffs when adding or removing tests easier to read.

While here, sort the list of tests.

Reviewed by: kevans, melifaro, asomers, markj, emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36908

(cherry picked from commit 9e0aaedd704ee8a040ecb1d1aadf0bd75ed4dc09)