revert(azure): revert removal (#3890)

* Revert "fix(sidebar): show docker sidebar when needed (#3852)"

This reverts commit 59da17dde4.

* Revert "refactor(azure): remove Azure ACI endpoint support (#3803)"

This reverts commit 493de20540.

app/azure/services/locationService.js

@@ -0,0 +1,29 @@
+import { LocationViewModel } from '../models/location';
+
+angular.module('portainer.azure').factory('LocationService', [
+  '$q',
+  'Location',
+  function LocationServiceFactory($q, Location) {
+    'use strict';
+    var service = {};
+
+    service.locations = function (subscriptionId) {
+      var deferred = $q.defer();
+
+      Location.query({ subscriptionId: subscriptionId })
+        .$promise.then(function success(data) {
+          var locations = data.value.map(function (item) {
+            return new LocationViewModel(item);
+          });
+          deferred.resolve(locations);
+        })
+        .catch(function error(err) {
+          deferred.reject({ msg: 'Unable to retrieve locations', err: err });
+        });
+
+      return deferred.promise;
+    };
+
+    return service;
+  },
+]);