test: fix test-cluster-worker-disconnect
test: fix test-cluster-worker-disconnect

- Just let the process exit gracefully after the worker is disconnected.

Reviewed-By: Brendan Ashworth <2a35967cb8cf8bc6bb9ebf86d18bb6cabb303f5b@me.com>
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>
PR-URL: https://github.com/nodejs/io.js/pull/1919
Fixes: https://github.com/nodejs/io.js/issues/1757

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node