[CentOS] selinux & rsyncd: Allowing global read for backup

Wed Jan 4 12:12:45 UTC 2017
Kenneth Porter <shiva at sewingwitch.com>

More digging and "getsebool -a | grep rsync" revealed the 
rsync_export_all_ro bool. I set that and now it looks like I can rsync from 
my BackupPC system.

setsebool -P rsync_export_all_ro 1

<https://linux.die.net/man/8/rsync_selinux>