netutils_wrapper: suppress sysfs denials

Addresses spurious denials caused by users of netutils_wrapper which
open files in /sys without O_CLOEXEC.
avc: denied { read } for comm="iptables-wrappe"
dev="sysfs" ino=47786 scontext=u:r:netutils_wrapper:s0
tcontext=u:object_r:sysfs_msm_subsys:s0 tclass=file

Test: build
Change-Id: I1c1f82428555be6a9798a189420dd85a9db107f7
1 file changed