Allows the number of pooled free sockets to equal maxSockets.
Previously it would only allow maxSockets - 1.
PR-URL: https://github.com/iojs/io.js/pull/1242
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Christian Tellnes <christian@tellnes.no>
