nuke: take config files from -t argument
nuke: take config files from -t argument

teuthology-lock and teuthology-updatekeys both use -t for this already

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