pyflakes cleanup.
pyflakes cleanup.

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