Merge branch 'net-explicitly-requires-bash-when-needed'

Paolo Abeni says:

====================
net: explicitly requires bash when needed.

Some test scripts require bash-only features but use the default shell.
This may cause random failures if the default shell is not bash.
Instead of doing a potentially complex rewrite of such scripts, these patches
require the bash interpreter, where needed.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/rtnetlink.sh

-#!/bin/sh
+#!/bin/bash
 #
 # This test is for checking rtnetlink callpaths, and get as much coverage as possible.
 #

tools/testing/selftests/net/udpgso_bench.sh

-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 #
 # Run a series of udpgso benchmarks