roles: use letters for mon, mds names
roles: use letters for mon, mds names

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