cleanup and fixes

supervisor/session/rtu/imatrix.lua

@@ -41,9 +41,6 @@ function imatrix.new(session_id, unit_id, advert, out_queue)
     if advert.type ~= RTU_UNIT_TYPE.IMATRIX then
         log.error("attempt to instantiate imatrix RTU for type " .. types.rtu_type_to_string(advert.type))
         return nil
-    elseif not util.is_int(advert.index) then
-        log.error("attempt to instantiate dynamicv RTU without index")
-        return nil
     end
 
     local log_tag = util.c("session.rtu(", session_id, ").imatrix[@", unit_id, "]: ")