Logs stream switch delays using analytics instead of callstats.

conference.js

 
         APP.UI.addListener(UIEvents.RESOLUTION_CHANGED,
             (id, oldResolution, newResolution, delay) => {
-            var logObject = {
-                id: "resolution_change",
-                participant: id,
-                oldValue: oldResolution,
-                newValue: newResolution,
-                delay: delay
-                };
-            room.sendApplicationLog(JSON.stringify(logObject));
+                // We only care about the delay between simulcast streams.
+                // Longer delays will be caused by something else and will just
+                // poison the data.
+                if (delay < 2000) {
+                    JitsiMeetJS.analytics
+                            .sendEvent('stream.switch.delay', delay);
+                }
         });
 
         // Starts or stops the recording for the conference.