Log a warning when explicit configuration indirectly overrides data annotations

[AndriySvyryd]

public class Table1
{
        public int Table1Id { get; set; }
        public string Name { get; set; }

        public virtual ICollection<Table2> MyTables { get; set; }
}

public class Table2
{
        public int Table2Id { get; set; }
        public int Table1Id { get; set; }
        [ForeignKey("Table1Id")]
        public virtual Table1 Table1 { get; set; }
}

protected override void OnModelCreating(ModelBuilder builder)
{
    builder.Entity<Table1>()
        .HasMany(e => e.MyTables)
        .WithOne(e => e.Table1)
        .IsRequired(false);
}