Use a nameless tempfile for local tarball, avoids cleanup.
Use a nameless tempfile for local tarball, avoids cleanup.

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