Revert "Merge pull request #6 from uber/0.0.4-dns-recovery.cleanup-timeout"

This reverts commit edad747e76c7c63a63d9779d7e09fa604f174725, reversing
changes made to 6888dd75c055a313663cf0649c177da2dfd7a241.

Conflicts:
	lib/EphemeralSocket.js
	test/socket.js
Merge pull request #14 from uber/0.0.4-dns-recovery.rollback-timeout

[DNS Recovery]: Revert the cleanup timeout code.