Removed all the unused directives in the Solution with the assistance of Resharper

src/Infrastructure/Data/Migrations/20171018175735_Initial.cs

@@ -1,7 +1,6 @@
 using Microsoft.EntityFrameworkCore.Metadata;
 using Microsoft.EntityFrameworkCore.Migrations;
 using System;
-using System.Collections.Generic;
 
 namespace Microsoft.eShopWeb.Infrastructure.Data.Migrations
 {

src/Infrastructure/Data/Migrations/CatalogContextModelSnapshot.cs

@@ -1,11 +1,8 @@
 // <auto-generated />
-using Microsoft.eShopWeb.Infrastructure.Data;
+
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Metadata;
-using Microsoft.EntityFrameworkCore.Migrations;
-using Microsoft.EntityFrameworkCore.Storage;
-using Microsoft.EntityFrameworkCore.Storage.Internal;
 using System;
 
 namespace Microsoft.eShopWeb.Infrastructure.Data.Migrations