sendmessage adds sockets to OPEN_SOCKET_INFO that are not cleaned up

[choksi81]

sendmessage creates a socket and adds it to OPEN_SOCKET_INFO, but the socket is never cleaned up. This is probably related to #872.

Also, the socket lock should be acquired prior to using the socket, but that is less important.

[choksi81]

Author: justinc This is a V2 issue that seems to be fixed. The only references of OPEN_SOCKET_INFO are checking for existence, not adding items.