GUI: Added ESLint to gulp tasks
GUI: Linted files
Fixed an error in the build script

JIRA-TASKS: ONOS-6522, ONOS-6521

Change-Id: Ie72abfe6cbe21c8946f219be6193344b67ec6dd1
diff --git a/web/gui/src/main/webapp/app/view/topo2/topo2Panel.js b/web/gui/src/main/webapp/app/view/topo2/topo2Panel.js
index 88ba678..dd7722b 100644
--- a/web/gui/src/main/webapp/app/view/topo2/topo2Panel.js
+++ b/web/gui/src/main/webapp/app/view/topo2/topo2Panel.js
@@ -51,16 +51,16 @@
             return this.footer.append(x);
         },
         emptyRegions: function () {
-            this.header.selectAll("*").remove();
-            this.body.selectAll("*").remove();
-            this.footer.selectAll("*").remove();
+            this.header.selectAll('*').remove();
+            this.body.selectAll('*').remove();
+            this.footer.selectAll('*').remove();
         },
         destroy: function () {
             ps.destroyPanel(this.id);
         },
         isVisible: function () {
             return this.el.isVisible();
-        }
+        },
     };
 
     angular.module('ovTopo2')
@@ -71,7 +71,7 @@
             ps = _ps_;
 
             return View.extend(panel);
-        }
+        },
     ]);
 
 })();