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

[Cron Daemon]

'testing2sid/master.log' -> 'testing2sid/master.20180114.log'
'stable2sid/master.log' -> 'stable2sid/master.20180114.log'
'stretch2buster/master.log' -> 'stretch2buster/master.20180114.log'
stretch-rcmd/master.20180113.log: 102.6 KiB / 1025.9 KiB = 0.100