Remove call to Normlize() for now

https://github.com/aspnet/Identity/issues/1149#issuecomment-290142263

Can bring it back once we are on 2.0

src/Microsoft.AspNetCore.Identity/UpperInvariantLookupNormalizer.cs

@@ -22,7 +22,7 @@ namespace Microsoft.AspNetCore.Identity
             {
                 return null;
             }
-            return key.Normalize().ToUpperInvariant();
+            return key.ToUpperInvariant();
         }
     }
-}
+}