software/ors-amarisoft: Start to organize Radio Unit related bits under ru/
Bring more structure to RU-specific code as a preparatory step for multiRU support: - move RU-specific files under ru/<RU-type>/ . This mostly moves Lopcomm programs and configuration files there. - move RU-specific instance code there as well. This also mostly moves Lopcomm specific services and promises there. - bring more structure in naming. As buildout has global namespace use ru_<RU-type>_ prefix to avoid collision in names. This should be a preparatory patch with practically no semantic change, but preparing ground for further multiRU landing. /cc @xavier_thompson, @Daetalus /reviewed-by @jhuge, @lu.xu /reviewed-on nexedi/slapos!1466