bugzilla - silence collectstats cron jobs

these cron jobs are running fine, but the output
is spammy and really doesn't need to be mailed to root

remove cron spam as requested by YuviPanda

also, soon we will not care about it anymore and use phab

Change-Id: Iab207a61587c0a04aeb4ecef5e7cf27b00284be9
Merge "bugzilla - silence collectstats cron jobs" into production