feat(webui): Add dashboard filter.

- Convert Object properties to and array for backends and frondends for each providers.
- Remove unused parameters.
- Add filter.

webui/src/app/sections/providers/providers.controller.js

@@ -2,17 +2,18 @@
 
 /** @ngInject */
 function ProvidersController($scope, $interval, $log, Providers) {
-  var vm = this;
+  const vm = this;
 
   vm.providers = Providers.get();
 
-  var intervalId = $interval(function () {
+  const intervalId = $interval(function () {
     Providers.get(function (providers) {
       vm.providers = providers;
     }, function (error) {
       vm.providers = {};
       $log.error(error);
     });
+
   }, 2000);
 
   $scope.$on('$destroy', function () {
@@ -20,4 +21,4 @@ function ProvidersController($scope, $interval, $log, Providers) {
   });
 }
 
-module.exports = ProvidersController;
+module.exports = ProvidersController;