[freeswitch] Fix a SIP session leak on negotiation errors

When a SIP session failed during negotiation, only its channel mappings were being cleared. The SIP UA AND Session would be left dangling, causing a leak and some more further problems

Also pretty print some errors on stop procedures

lib/mcs-core/lib/adapters/freeswitch/freeswitch.js

@@ -324,21 +324,21 @@ module.exports = class Freeswitch extends EventEmitter {
       await this._stopUserAgent(elementId);
     } catch (error) {
       Logger.error(LOG_PREFIX, `Error when stopping userAgent for ${elementId} at room ${roomId}`,
-        { error });
+        { error: this._handleError(error) });
     }
 
     try {
       await this._stopRtpConverter(roomId, elementId);
     } catch (error) {
       Logger.error(LOG_PREFIX, `Error when stopping RTP converter for ${elementId} at room ${roomId}`,
-        { error });
+        { error: this._handleError(error) });
     }
 
     try {
       await this._stopRtpProxy(roomId, elementId);
     } catch (error) {
       Logger.error(LOG_PREFIX, `Error when stopping RTP proxy for ${elementId} at room ${roomId}`,
-        { error });
+        { error: this._handleError(error) });
     }
   }
 
@@ -514,11 +514,12 @@ module.exports = class Freeswitch extends EventEmitter {
           session.on(C.EVENT.REINVITE, handleReinvite.bind(this));
 
           const handleNegotiationError = (c) => {
-            this._deleteChannelMappings(elementId);
             if (!isNegotiated) {
               isNegotiated = true;
-              return reject(this._handleError(C.ERROR.MEDIA_PROCESS_OFFER_FAILED));
+              reject(this._handleError(C.ERROR.MEDIA_PROCESS_OFFER_FAILED));
             }
+
+            this.stop(voiceBridge, C.MEDIA_TYPE.RTP, elementId)
           }
 
           session.on('accepted', (response, cause) => {