workunits: remove unused variable
workunits: remove unused variable

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