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

[Cron Daemon]

'buster/master.log' -> 'buster/master.20171225.log'
stretch2buster/master.20171224.log: 94.2 KiB / 1103.2 KiB = 0.085, 0:01
stretch2proposed/master.20171224.log: 84.5 KiB / 1070.8 KiB = 0.079