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

[Cron Daemon]

'sid-nodoc/master.log' -> 'sid-nodoc/master.20180519.log'
testing2sid/master.20180518.log: 87.3 KiB / 1143.0 KiB = 0.076
stretch2buster-rcmd/master.20180518.log: 91.0 KiB / 1055.3 KiB = 0.086