transport: Change log level for HTTP request errors
transport: Change log level for HTTP request errors

We already know that RoDI sometimes can't cope with the request rate
making some of these to timeout. So instead of printing all these to
the standard error, print them as a debug information instead.

Since now is only printed for debug purposes, also add the used URL.

benjayah/rodi_robot,rodibot/rosdi_ws,rodibot/rodi_robot