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

[Cron Daemon]

'testing2sid/master.log' -> 'testing2sid/master.20170913.log'
stretch2bpo/master.20170912.log: 50.0 KiB / 1038.5 KiB = 0.048
'stretch2proposed/master.log' -> 'stretch2proposed/master.20170913.log'
jessie/master.20170912.log: 96.4 KiB / 1071.8 KiB = 0.090