pid-sandbox: whitelist selected pkg_* phases (bug 673794)

Whitelist the same phases that are whitelisted for FEATURES=cgroup,
since pid-sandbox is less valuable and is likely to have unintended
consenquences during these phases.

Bug: https://bugs.gentoo.org/673794
Reviewed-by: Michał Górny <mgorny@gentoo.org>
Signed-off-by: Zac Medico <zmedico@gentoo.org>
2 files changed