Added external auth url support

Author: Marat-Gumerov

src/internal/auth.ts

@@ -77,7 +77,7 @@ export class JwtAuth implements IAuthentication {
 
         const requestOptions: request.Options = {
             method: "POST",
-            uri: configuration.baseUrl + "connect/token",
+            uri: configuration.authUrl + "connect/token",
             body: postData,
             headers: { 
                 "Content-Type": "application/x-www-form-urlencoded",

src/internal/configuration.ts

@@ -59,6 +59,11 @@ export class Configuration {
      */
     public apiVersion: string = "v3.0";
 
+    /**
+     * Should not be used
+     */
+    public authUrl: string;
+
     /**
      * If you use custom on-premise server with metered license.
      * This way, you only need to specify the API base URL.
@@ -79,6 +84,7 @@ export class Configuration {
 
             this.baseUrl = baseUrl;
         }
+        this.authUrl = this.baseUrl;
 
         this.appSID = appSID;
         this.appKey = appKey;