Copy ice servers from kurento-utils.js and Close peerConnection

bigbluebutton-html5/imports/utils/safari-webrtc.js

+const iceServersList = [
+	{urls:"stun:stun.l.google.com:19302"},
+	{urls:"stun:stun1.l.google.com:19302"},
+	{urls:"stun:stun2.l.google.com:19302"},
+	{urls:"stun:stun3.l.google.com:19302"},
+	{urls:"stun:stun4.l.google.com:19302"},
+	{urls:"stun:stun.ekiga.net"},
+	{urls:"stun:stun.ideasip.com"},
+	{urls:"stun:stun.schlund.de"},
+	{urls:"stun:stun.stunprotocol.org:3478"},
+	{urls:"stun:stun.voiparound.com"},
+	{urls:"stun:stun.voipbuster.com"},
+	{urls:"stun:stun.voipstunt.com"},
+	{urls:"stun:stun.voxgratia.org"},
+	{urls:"stun:stun.services.mozilla.com"}
+	];
+
+
 export function canGenerateIceCandidates() {
     
     return new Promise((resolve, reject) => {
-		pc = new RTCPeerConnection({iceServers: [ {urls:'stun:stun.l.google.com:19302'}  ]});
+		pc = new RTCPeerConnection({iceServers: iceServersList});
 		countIceCandidates = 0;
 
 		try{ pc.addTransceiver('audio'); } catch (e) {}
@@ -18,7 +36,8 @@ export function canGenerateIceCandidates() {
 			if(e.currentTarget.iceGatheringState == 'complete' && countIceCandidates == 0) reject();
 		}
 		
-		setTimeout(function(){ 
+		setTimeout(function(){
+			pc.close();
 			if(!countIceCandidates) reject();
 		}, 3000);