Commented Issue: Can't modify key after convention model builder added entity [471]

After ODataConventionModelBuilder add an entity, user can't change the key property to another one.

For example:
public class Todo
{
public int TodoID { get; set; }
public string Name { get; set; }
}

var builder = new ODataConventionModelBuilder();
var todoes = builder.EntitySet<Todo>("Todo");
todoes.EntityType.HasKey(t => t.Name);

It will add another compound primary key to the model but there is no way to remove the TodoID from primary key.



Comments: We should detect if someone has called HasKey(), then we should not try to infer the key as ToDoID as the key any more.