Admin page (#324)

* Updates based on documentation

* Getting the build passing

* Getting app functioning

* A few cleanups to confirm it's working as expected

* Fixing functional tests

* Updating dockerfile for 3.0

* Functional Tests now run sequentially

* Updating to latest version of moq

* Adding migration for post 3.0 upgrades

* Removing commented out lines

* Moving address and catalogitemordered configuration in to classes that own them

* Adding admin user

* Adding admin catalog screen

- will also only display menu option if user is logged in as an admin

* WIP - squash this

* Allow user to edit a catalog item

* Adding entry for new service

* Invalidating cache after catalog item update

- also a little bit of cleanup

* Fixing bad merge

* Removing Picture Uri and making Id readonly

* Adjusting style in menu dropdown so all options are shown

* Creating Cache helpers with unit tests

src/Web/Extensions/CacheHelpers.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace Microsoft.eShopWeb.Web.Extensions
+{
+    public static class CacheHelpers
+    {
+        public static readonly TimeSpan DefaultCacheDuration = TimeSpan.FromSeconds(30);
+        private static readonly string _itemsKeyTemplate = "items-{0}-{1}-{2}-{3}";
+
+        public static string GenerateCatalogItemCacheKey(int pageIndex, int itemsPage, int? brandId, int? typeId)
+        {
+            return string.Format(_itemsKeyTemplate, pageIndex, itemsPage, brandId, typeId);
+        }
+
+        public static string GenerateBrandsCacheKey()
+        {
+            return "brands";
+        }
+
+        public static string GenerateTypesCacheKey()
+        {
+            return "types";
+        }
+    }
+}