Bug#22972595 - FAILING ASSERTION: NODE_START != (OS_OFFSET_T) -1 WITH DDL+DML USING XCONNECTION

Description: Mysqlx was closing same file desriptor two times. First from
xpl::Client::~Clinet -> Connection_vio::close, second from first from
xpl::Client::~Clinet -> Connection_vio::close. After first call the same descriptor id
could be allocated at another open, socket call (from antoher thread). Second call to close was
invalidating the just allocated socket.

Reviewed-by: Jakub Nowakowski <[email protected]>
Reviewed-by: Andrzej Religa <[email protected]>
RB: 12247

Author: lkotula

rapid/plugin/x/ngs/src/server.cc

@@ -397,7 +397,6 @@ void Server::on_accept(int sock, short what, void *ctx)
     {
       self->m_delegate->did_reject_client(Server_delegate::TooManyConnections);
       log_warning("Unable to accept connection, disconnecting client");
-      Connection_vio::close_socket(nsock);
     }
   }
 }