IRRd 4.0.0 release candidate 5

ae2940b Only perform source ordering when needed for improved performance.
67c61f1 Fix validation of configuration files for timers.
54e60fa Improve performance.
7d15f1d Fix minor issues in integration test.
87e509f Add a small load testing script.
5380035 Change log "received query" to more correct "processing query"
ede8b3d Add log for elapsed time for processing query.