[esnet/iperf] 49a577: IP don't fragment support (#1119)

[David Bar-On]

Branch: refs/heads/master
Home: https://github.com/esnet/iperf
Commit: 49a5771af1a49a187bdd97614f1e77b6abbcc5bf
https://github.com/esnet/iperf/commit/49a5771af1a49a187bdd97614f1e77b6abbcc5bf
Author: David Bar-On <61089727+d...@users.noreply.github.com>
Date: 2021-02-16 (Tue, 16 Feb 2021)

Changed paths:
M aclocal.m4
M configure
M configure.ac
M src/iperf.h
M src/iperf3.1
M src/iperf_api.c
M src/iperf_api.h
M src/iperf_config.h.in
M src/iperf_error.c
M src/iperf_locale.c
M src/iperf_util.c

Log Message:
-----------
IP don't fragment support (#1119)

Adds an --dont-fragment flag that sets the DF flag in the header for UDP/IPv4 tests.

Co-authored-by: root <ro...@DESKTOP-L81E90U.localdomain>
Co-authored-by: Bruce A. Mah <bm...@es.net>