Bug 863997

+++ This bug was initially created as a clone of Bug #802636 +++

Description of problem:

The yum man page says the following:
"   check-update
Implemented  so  you  could know if your machine had any updates that needed to be applied without running it interactively. Returns exit value of 100 if there are packages available for an update. Also returns a list of the packages to  be  updated in  list format. Returns 0 if no packages are available for update. Returns 1 if an error occurred.  Running in verbose mode
also shows obsoletes."

However when system is not able to reach rhn/satellite it returns 0 instead of 1 :

----------
# yum check-update
Loaded plugins: product-id, rhnplugin, subscription-manager
Updating certificate-based repositories.
There was an error communicating with RHN.
RHN Satellite or RHN Classic support will be disabled.
Error communicating with server. The message was:
Connection refused

# echo $?
0
----------

It should have returned 1 instead of 0

Version-Release number of selected component (if applicable):
yum-rhn-plugin-0.9.1-36.el6.noarch

How reproducible:
Always

Steps to Reproduce:
1.Edit /etc/sysconfig/rhn/update file and alter the rhn/satellite FQDN under  serverURL in such a way that system is unable to reach it or unable to resolve the FQDN
2.Execute :
yum check-update
3. Once it fails then execute :
echo $?
  
Actual results:
0

Expected results:
1

Additional info:
N/A