task.internal: use packaging.GitbuilderProject in internal.check_packages
task.internal: use packaging.GitbuilderProject in internal.check_packages

Signed-off-by: Andrew Schoen <1bb641dc23c3a93cce4eee683bcf4b2bea7903a3@redhat.com>

caibo2014/teuthology,ceph/teuthology,ktdreyer/teuthology,robbat2/teuthology,dmick/teuthology,dreamhost/teuthology,SUSE/teuthology,dmick/teuthology,michaelsevilla/teuthology,michaelsevilla/teuthology,dreamhost/teuthology,SUSE/teuthology,dmick/teuthology,caibo2014/teuthology,ceph/teuthology,ktdreyer/teuthology,SUSE/teuthology,robbat2/teuthology