GUI2 Changed loading screen display to be a component

Change-Id: Id1592b498e6827ec4cd3544dec92e46f00e8d378
diff --git a/web/gui2-fw-lib/src/app/app.component.html b/web/gui2-fw-lib/src/app/app.component.html
index f8d881f..2cc727e 100644
--- a/web/gui2-fw-lib/src/app/app.component.html
+++ b/web/gui2-fw-lib/src/app/app.component.html
@@ -45,3 +45,5 @@
   it is picked up in this app.
 </p>
 <onos-quickhelp></onos-quickhelp>
+<onos-loading [running]="loadingRunning"></onos-loading>
+<button (click)="toggleLoadingRunning()">Toggle loading image</button>