Add pkginfo to jeepyb.

Needed by the mirror script.

Change-Id: I0a30632810307a47ca473216d584dbcb9ed78a48
Reviewed-on: https://review.openstack.org/24864
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins