[bug-inetutils] tests/tftp.sh: Portability to *FreeBSD.

[Mats Erik Andersson]

Hello again,

due to differing output from "netstat -na", my previous
additions to "tftp.sh" did not work well neither for
FreeBSD 8.0, nor for GNU/kFreeBSD 8.1.

The following change works now works on

   GNU/Linux, GNU/kFreeBSD, FreeBSD, and OpenBSD.

I was forced to switch to "egrep" in order to use
a pattern within OpenBSD. The standard group escaping
for "grep" does not work properly there.

The script only contains a minute rudiment for
treating IPv6 tests. More will follow as soon
as my still pending patch to "src/tftp.c" gets
committed by a senior member of the project!


Best regards as always,

Mats

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