[selinux] allow frontend's apache to ioctl uploaded tarballs
Resolves those warnings:
type=AVC msg=audit(1536733036.786:132): avc: denied { ioctl }
for pid=991 comm="httpd"
path="/var/lib/copr/data/srpm_storage/tmpricdq2lf/dummy-pkg-20180912_0817-0.src.rpm"
dev="vda1" ino=266497 ioctlcmd=0x5401
scontext=system_u:system_r:httpd_t:s0
tcontext=system_u:object_r:copr_data_t:s0 tclass=file
permissive=0