Goals

• Support non-OCS clients (without {loadBalanced: true}

  ) on mongos' proxy protocol (loadBalancer) port.

• Keep supporting OCS clients on mongos' proxy protocol port.
• Ensure serviceId is not returned to non-OCS clients.
• Ensure AsioSessionManager::_loadBalancedConnections is correctly updated
  • This parameter tracks the number of OCS clients (which includes {loadBalanced: true}

    in their hello) and must continue to do so.