Add a new option, -P, to pkt-gen which reads a single packet from a stored
pcap file and transmits it instead of the default UDP packet.

Reviewed by:	luigi
MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272962 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
pstat(8): Correct description of the SESS column in pstat -t.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272963 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f