Fixing logging

First, setting up the default logger name for worker and verifier.
Without this, logging from the reconciler and the database api
will end up in stacktach-default. This would mean both the
verifier and worker will be attempting to rotate that log file,
thus locking themselves.

Second, using the child logging process when calling the
info/warn/error functions directly in stacklog. Othweise this will
cause the callers to get or create the parent logger process.