6803384 ipmpstat usage message should be more helpful

[peter.memish...@sun.com]

Author: meem <Peter.Memishian at Sun.COM>
Repository: /hg/onnv/onnv-gate
Latest revision: a95ac562c9f459d223dce7070f01962782d1c1b0
Total changesets: 1
Log message:
6803384 ipmpstat usage message should be more helpful

Files:
        update: usr/src/cmd/cmd-inet/usr.sbin/ipmpstat/ipmpstat.c