Write state dir to smb.conf
    
    smb.conf now sets state and cache directory, then includes the registry.
    This also allows us to write the final smb.conf before importing
    remaining settings into the Samba registry.
    
    Fixes: https://pagure.io/freeipa/issue/8401
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>