suite: print out subset chosen
suite: print out subset chosen

Signed-off-by: Samuel Just <16ccadb3f2bf0703b4be974f8606e7e98c1cda29@redhat.com>

ktdreyer/teuthology,t-miyamae/teuthology,michaelsevilla/teuthology,michaelsevilla/teuthology,robbat2/teuthology,t-miyamae/teuthology,robbat2/teuthology,dmick/teuthology,dreamhost/teuthology,caibo2014/teuthology,SUSE/teuthology,ktdreyer/teuthology,ivotron/teuthology,ceph/teuthology,SUSE/teuthology,dmick/teuthology,caibo2014/teuthology,ceph/teuthology,ivotron/teuthology,dmick/teuthology,zhouyuan/teuthology,SUSE/teuthology,dreamhost/teuthology,zhouyuan/teuthology