FreeBSD/src 9531253 (r351212). ObsoleteFiles.inc, tests/sys/netpfil/common pft_ping.py sniffer.py

netpfil tests: Move pft_ping.py and sniffer.py to the common test directory

The pft_ping.py and sniffer.py tool is moved from tests/sys/netpfil/pf to
tests/sys/netpfil/common directory because these tools are to be used in
common for all the firewalls.

Submitted by:   Ahsan Barkati
Reviewed by:    kp, thj
Sponsored by:   Google, Inc. (GSoC 2019)
Differential Revision:  https://reviews.freebsd.org/D21276
DeltaFile
+135-0tests/sys/netpfil/common/pft_ping.py
+0-135tests/sys/netpfil/pf/pft_ping.py
+25-0tests/sys/netpfil/common/sniffer.py
+0-25tests/sys/netpfil/pf/sniffer.py
+10-8tests/sys/netpfil/pf/forward.sh
+8-6tests/sys/netpfil/pf/set_tos.sh
+5-1tests/sys/netpfil/common/Makefile
+0-3tests/sys/netpfil/pf/Makefile
+3-0ObsoleteFiles.inc
+186-1789 files

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