FreeBSD/src 7cc426f (r351393)sbin/ping/tests ping_test.sh ping_c1_s56_t1.out

ping: add a basic functional test

Submitted by:   Ján Sučan <sucanjan at gmail.com>
MFC after:      2 weeks
Sponsored by:   Google, inc. (Google Summer of Code 2019)
Differential Revision:  https://reviews.freebsd.org/D21289
DeltaFile
+55-0sbin/ping/tests/ping_test.sh
+6-0sbin/ping/tests/ping_c1_s56_t1.out
+5-0sbin/ping/tests/Makefile
+66-03 files

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