handle altLanguages set at the session level via config verb; fix azure stt race condition with final transcripts from stopped recognition

lib/session/call-session.js

@@ -274,6 +274,18 @@ class CallSession extends Emitter {
     return this._globalSttHints;
   }
 
+  set altLanguages(langs) {
+    this._globalAltLanguages = langs;
+  }
+
+  get hasAltLanguages() {
+    return Array.isArray(this._globalAltLanguages);
+  }
+
+  get altLanguages() {
+    return this._globalAltLanguages;
+  }
+
   async notifyRecordOptions(opts) {
     const {action} = opts;
     this.logger.debug({opts}, 'CallSession:notifyRecordOptions');
@@ -1112,7 +1124,6 @@ class CallSession extends Emitter {
    * @param {Task} task - task to be executed
    */
   async _evalEndpointPrecondition(task) {
-    this.logger.debug('CallSession:_evalEndpointPrecondition');
     if (this.callGone) new Error(`${BADPRECONDITIONS}: call gone`);
 
     if (this.ep) {