Don't allow stateless operations on a binding until fully initialized

[thhous-msft]

A small race condition exists if a server binding is created and runs out of memory at a specific point in the process. If the socket and at least 1 receive buffer gets allocated, a packet can be received on that receive queue. This receive can post a stateless operation, even if one of the later receive buffers fails to allocate, and cause the socket and binding to be cleaned up early. During binding cleanup, there will be a stateless operation in the binding queue, causing an assertion to be hit.

The solution to this is to not allow a stateless operation to queue until the binding has been fully initialized. The packet will be dropped instead, which is fine.