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

[Cron Daemon]

'sid2experimental/master.log' -> 'sid2experimental/master.20180725.log'
'sid-nodoc/master.log' -> 'sid-nodoc/master.20180725.log'
testing2sid/master.20180724.log: 72.4 KiB / 1030.7 KiB = 0.070
buster/master.20180724.log: 100.3 KiB / 1099.2 KiB = 0.091