[cleaner] sos clean -vvv does not write to sos log files

[pmoravec]

Running sos clean on an existing sosreport, it never writes - even debug logs - to either log file. sos_logs/ui.log and sos_logs/sos.log are not touched. That differs from running sos report --clean with either verbosity mode.

On one side, sos clean should just clean the given sosreport and not alter it otherwise. On the other side, it should log somewhere its activity, and those files are the most applicable ones.

Some objections to enhancing sos clean by logging to the files?