do not call tcp/udp ::stopAll() when it is not required to do so

[d-a-v]

fixes #6123

[mcspr]

ArduinoOTA as well? Even a failed update kills every client
Also note of WebUpdate example

Continuing the idea, UpdaterClass should probably handle that

Arduino/libraries/ArduinoOTA/ArduinoOTA.h

Lines 50 to 61 in 8bfc2e9

	//This callback will be called when OTA connection has begun
	void onStart(THandlerFunction fn);
	//This callback will be called when OTA has finished
	void onEnd(THandlerFunction fn);
	//This callback will be called when OTA encountered Error
	void onError(THandlerFunction_Error fn);
	//This callback will be called when OTA is receiving data
	void onProgress(THandlerFunction_Progress fn);

Where the user might as well do the

WiFiClient::stopAll();
WiFiUDP::stopAll();

// or, where we want some fine grained control
WiFiClient::stopAllExcept(&server.client());
WiFiUDP::stopAllExcept(&myPreciousCnC);