feat(network): display the correct error message when a network deletion failure occurs

app/components/network/networkController.js

@@ -17,9 +17,15 @@ function ($scope, Network, Messages, $state, $stateParams, errorMsgFilter) {
   $scope.remove = function remove(networkId) {
     $('#loadingViewSpinner').show();
     Network.remove({id: $stateParams.id}, function (d) {
+      var error = errorMsgFilter(d);
+      if (error) {
         $('#loadingViewSpinner').hide();
-      Messages.send("Network removed", "");
+        Messages.send("Error", error);
+      } else {
+        $('#loadingViewSpinner').hide();
+        Messages.send("Network deleted", $stateParams.id);
         $state.go('networks', {});
+      }
     }, function (e) {
       $('#loadingViewSpinner').hide();
       Messages.error("Failure", e.data);

app/components/networks/networksController.js

@@ -47,7 +47,7 @@ function ($scope, $state, Network, Config, Messages, errorMsgFilter) {
         Network.remove({id: network.Id}, function (d) {
           var error = errorMsgFilter(d);
           if (error) {
-            Messages.send("Error", "Unable to remove network with active endpoints");
+            Messages.send("Error", error);
           } else {
             Messages.send("Network deleted", network.Id);
             var index = $scope.networks.indexOf(network);