EFI_TCP6_LISTEN_TOKEN returns when list operation finishes.
The Status in CompletionToken will be set to the following value if accept finishes: EFI_SUCCESS: A remote peer has successfully established a connection to this instance. A new TCP instance has also been created for the connection. EFI_CONNECTION_RESET: The accept fails because the connection is reset either by instance itself or communication peer. EFI_ABORTED: The accept request has been aborted. EFI_SECURITY_VIOLATION: The accept operation was failed because of IPSec policy check.
1.8.6 
