add test requirements to requirements file
add test requirements to requirements file

Signed-off-by: Alfredo Deza <a527f45c4d359ddc0a14b8fd7ba6d4b9e5a271c5@deza.pe>

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