filestore_idempotent: remove unused import
filestore_idempotent: remove unused import

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