Jobs List: add refresh method

Resolves #912

Author: oodamien

ui/src/app/jobs/jobs/jobs.component.ts

@@ -160,6 +160,13 @@ export class JobsComponent implements OnInit, OnDestroy {
     this.busyService.addSubscription(busy);
   }
 
+  /**
+   * Refresh action
+   */
+  refresh() {
+    this.loadJobExecutions();
+  }
+
   /**
    * Update event from the Paginator Pager
    * @param params