put filestore xattr option in [global]
put filestore xattr option in [global]

...for test_filestore_idempotent's benefit

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