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

[Cron Daemon]

'sid-strict/master.log' -> 'sid-strict/master.20180704.log'
'jessie2bpo2stretch/master.log' -> 'jessie2bpo2stretch/master.20180704.log'
'jessie-security/master.log' -> 'jessie-security/master.20180704.log'