Don't assume the ubuntu user when getting the test dir.
Don't assume the ubuntu user when getting the test dir.

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