improve logging

improve logging

- connection failed message puts requeued in parens
- connection success message, idle connection closed by us message,
   idle connection closed by peer message, are all info not notice
- flush timeout autodefer message is info not warn if we have no
   conns as this is normal with lack of conns and lack of conns
   already reported
- new notice messages summarising number of conns
- normal processed batch thing says "batch" not "feedfile"
- innduct-stats-report: count messages of priority info too.