Fix pppoe tests on aarch64 (selinux)
Created by: fpokryvk
pppoe tests were failing because selinux policy was different on aarch64, since this BZ is WONTFIX, https://bugzilla.redhat.com/show_bug.cgi?id=1643954, adding custom selinux policy.
ifup_policy.pp moved to tmp/selinux-policy/, where it belongs