mdns_netif_action() function

Set esp_netif to a desired state, or perform a desired action, such as enable/disable this interface or send announcement packets to this netif * This function is used to enable (probe, resolve conflicts and announce), announce, or disable (send bye) mDNS services on the specified network interface. * This function must be called if users registers a specific interface using mdns_register_netif() to enable mDNS services on that interface. * This function could be used in IP/connection event handlers to automatically enable/announce mDNS services when network properties change and/or disable them on disconnection.