Add approved and open

tool to identify previously approved but open patches. Due to required rebase.

Change-Id: I4b87c36e7ce077f2cec2bbeb910f0c8f7ae3d080
Reviewed-on: https://review.openstack.org/36100
Approved: Russell Bryant <rbryant@redhat.com>
Reviewed-by: Russell Bryant <rbryant@redhat.com>
Tested-by: Jenkins