[Piuparts-reports] Cron <piupartsm at pejacevic> rotate_master_logs

[Cron Daemon]

'sid-strict/master.log' -> 'sid-strict/master.20181003.log'
'stretch/master.log' -> 'stretch/master.20181003.log'
'stretch-rcmd/master.log' -> 'stretch-rcmd/master.20181003.log'
'jessie2proposed/master.log' -> 'jessie2proposed/master.20181003.log'