ONOS-2849: Refactored topo dialog to general DialogService. Implemented confirmation dialog in App view.

Change-Id: Ib20e98253b2d13f7d7debef2dea5a530b61ced99
diff --git a/web/gui/src/main/webapp/app/view/app/app.css b/web/gui/src/main/webapp/app/view/app/app.css
index 9413369..528c622 100644
--- a/web/gui/src/main/webapp/app/view/app/app.css
+++ b/web/gui/src/main/webapp/app/view/app/app.css
@@ -30,3 +30,8 @@
 #ov-app input#uploadFile {
     display: none;
 }
+
+#app-dialog p {
+    color: darkred;
+    font-size: 12pt;
+}