Ticket 47520 - Fix various issues with logconv.pl
Bug Description: When testing an access log that contains "internal" connections/ops, many
warning messages are created. Other warnings are generated because the
DB_File arrays need to have thier elements checked before comparing to other
Fix Description: Improve value checking. Add support for connection numbers that are words (Internal),
and negative values for op ids(-1).
Reviewed by: richm(Thanks!)