Configuration attribute does not automatically register nested classes

[fb-smit]

Consider the following case

[Configuration("persistence")]
public class PersistenceConfiguration
{
    public SqlServerConfiguration SqlServer { get; set; }
    public SmbConfiguration Smb { get; set; }
}

Current Behaviour
The webhost currently only auto registers the PeristenceConfiguration with the IoC Container bc it has the attribute, the nested config classes will not be registed automatically.

Expected Behaviour
Nested configuration classes are also automatically registered as singleton in the IoC Container.

[lukas-kd]

Proposal:
Allow specifing a node in the Configuriation-Attribute like "persistence.sqlServer", and add the attribute on the SqlServerConfiguration.