Netcore3.0 (#323)

* 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

* Minor cleanups

tests/FunctionalTests/Web/Controllers/OrderControllerIndex.cs

@@ -7,6 +7,7 @@ using Xunit;
 
 namespace Microsoft.eShopWeb.FunctionalTests.Web.Controllers
 {
+    [Collection("Sequential")]
     public class OrderIndexOnGet : IClassFixture<CustomWebApplicationFactory<Startup>>
     {
         public OrderIndexOnGet(CustomWebApplicationFactory<Startup> factory)