add servicedir entry at live addon. Add enabled at configuration group entry. Move status entry from path to live addon

simplify interface of service_is_g and its functionality, provide service_get_treename as replacement

Do not warn the user about this feature. It only used on very specific case like module migration process.
Badly used, this features can easily broke the sanity of the system state

add service_resolve_write_tmp and state_write_tmp function to be able to write those files at a temporary directory