test_repo_utils: fix shared temporary directory
test_repo_utils: fix shared temporary directory

Signed-off-by: Kyr <82d0c7561ff7e9a20a19db22e8fb5b2adaa3d71e@suse.com>

ceph/teuthology,ktdreyer/teuthology,ceph/teuthology,dmick/teuthology,dmick/teuthology,ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,dmick/teuthology,SUSE/teuthology