pid-sandbox: run pid-ns-init as root (bug 675868)

Drop permissions only for subprocess of pid-ns-init but not pid-ns-init
itself. With FEATURES="pid-sandbox userpriv", pid-ns-init should be
run with unchanged permissions (usually UID=0, GID=0).

Bug: https://bugs.gentoo.org/675868
Signed-off-by: Arfrever Frehtes Taifersar Arahesis <Arfrever@Apache.Org>
Signed-off-by: Zac Medico <zmedico@gentoo.org>
2 files changed