Change logging level when no order is found in feature

[rdlopes]

Hi folks,

Re-enabling logs was great, I can now see what goes on during Feature parsing.

There's just one annoying thing: when Feature tries to parse order and doesn't find any, whether in comments or tags, it warns in logs.
But I think the warning level is misleading, as it's perfectly normal not to have any order in feature.

So this could be a good idea to downgrade log level to debug; it will still be here, only available in debugging sessions.