selftests: do not require bash to run netsocktests testcase

BugLink: http://bugs.launchpad.net/bugs/1658091

commit 3659f98b upstream.

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>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

tools/testing/selftests/net/run_netsocktests

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