netfilter: selftest: conntrack_vrf.sh: fix file permission

stable inclusion
from stable-v5.10.86
commit 32414491834c80ab39519467deb3f8d1e4f5bade
bugzilla: 186045 https://gitee.com/openeuler/kernel/issues/I4QVPD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=32414491834c80ab39519467deb3f8d1e4f5bade

--------------------------------

When backporting 33b8aad2 ("selftests: netfilter: add a
vrf+conntrack testcase") to this stable branch, the executable bits were
not properly set on the
tools/testing/selftests/netfilter/conntrack_vrf.sh file due to quilt not
honoring them.

Fix this up manually by setting the correct mode.
Reported-by: N"Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@nokia.com>
Link: https://lore.kernel.org/r/234d7a6a81664610fdf21ac72730f8bd10d3f46f.camel@nokia.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>