Description of problem:
There is error in script which cause disfunction of settings in /etc/sysconfig/yum-cron

Version-Release number of selected component (if applicable):
yum-cron-0.9.2-2.el6.noarch

How reproducible:
always

Steps to Reproduce:
1. set CHECK_ONLY=yes in /etc/sysconfig/yum-cron
2. system is updated every night instead of check only
3.
  
Actual results:
with this setting: CHECK_ONLY=yes
system is checked for update every night, sends mail info and then is updated

Expected results:
with this setting: CHECK_ONLY=yes
system is checked for update every night and sends mail info only

Additional info:
change line 15 in /etc/cron.daily/0yum.cron
from:
  source /etc/sysconfig/yum-cron
to:
  . /etc/sysconfig/yum-cron