BUG/MEDIUM: applet: Improve again spinning loops detection with the new API

BUG/MEDIUM: applet: Improve again spinning loops detection with the new API

A first attempt to fix this issue was already pushed (54b7539d6 "BUG/MEDIUM:
apppet: Improve spinning loop detection with the new API"). But it not was
fully accurrate. Indeed, we must check if something was received or sent by
the applet before incrementing the call rate. But we must also take care the
applet is allowed to receive or send data. That is what is performed in this
patch.

This patch must be backported as far as 3.0 with the patch above.