Freeze Break Request: s3-mirror adjustments

[Kevin Fenzi]

First, I noticed we are running the full sync twice right now, at the
same time: 

[root@mm-backend01 cron.d][PROD]# cat /etc/cron.d/s3.sh 
#Ansible: s3sync
0 0,11 * * * s3-mirror /usr/local/bin/lock-wrapper s3sync /usr/local/bin/s3.sh 2>&1
| /usr/local/bin/nag-once s3.sh 1d 2>
&1
#Ansible: s3sync-main
0 0 * * * s3-mirror /usr/local/bin/lock-wrapper s3sync-main /usr/local/bin/s3.sh
2>&1 | /usr/local/bin/nag-once s3.sh 1d 
2>&1

Second, the attached patch changes the sync scripts to: 

* do one sync with no --delete and excluding repodata
* do another one with --delete and including repodata
* invalidate the repodata

I adjusted the cron jobs to handle the repodata invalidate (I think). 

TODO: only sync when things have changed. 

+1s?

kevin
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