Fix. `test_metadata` hangup on test failure.
Fix. `test_metadata` hangup on test failure.

moteus/lzmq,zeromq/lzmq,moteus/lzmq,LuaDist/lzmq-ffi,LuaDist/lzmq,LuaDist/lzmq-ffi,zeromq/lzmq,LuaDist/lzmq,bsn069/lzmq,bsn069/lzmq,moteus/lzmq,zeromq/lzmq