selftests: do not require bash to run netsocktests testcase

[ Upstream commit 3659f98b ]

Nothing in this minimal script seems to require bash. We often run these
tests on embedded devices where the only shell available is the busybox
ash. Use sh instead.
Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Cc: stable@vger.kernel.org
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

tools/testing/selftests/net/run_netsocktests

-#!/bin/bash
+#!/bin/sh
 
 echo "--------------------"
 echo "running socket test"