Ability to display authors when CLI option is used about insights-results-aggregator-cleaner

[tisnik]

Implemented:

 $ ./insights-results-aggregator-cleaner --help

Clowder is not enabled, skipping init...
 Usage of ./insights-results-aggregator-cleaner:
 -authors
 show authors
 -cleanup
 perform database cleanup
 -clusters string
 list of clusters to cleanup
 -fill-in-db
 fill-in database by test data
 -max-age string
 max age for displaying old records
 -multiple-rule-disable
 list clusters with the same rule(s) disabled by different users
 -output string
 filename for old cluster listing
 -show-configuration
 show configuration
 -summary
 print summary table after cleanup
 -version
 show cleaner version

And:

 $ ./insights-results-aggregator-cleaner --authors

Clowder is not enabled, skipping init...

{"level":"info","filename":"config","time":"2021-09-08T08:01:50+02:00","message":"parsing configuration file"}

Clowder is disabled
 8:01AM DBG Started
 8:01AM INF DB connection configuration driverName=postgres
 Pavel Tisnovsky, Red Hat Inc.
 8:01AM DBG Finished