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Description of problem:
On a system with no 'default_realm' set in /etc/krb5.conf, where one is set in /etc/sssd/sssd.conf, authconfig won't write the value to /etc/krb5.conf unless the user changes it from the value that's already set in sssd.conf, even when sssd isn't being used.

Version-Release number of selected component (if applicable):
authconfig-6.1.4-6.el6

How reproducible:
Always

Steps to Reproduce:
1. Run /usr/sbin/authconfig --updateall --enablekrb5 \
               --enablekrb5realmdns --enablekrb5kdcdns --enablecache \
               --enableshadow --enablemd5 --enablenis --nisdomain=redhat.com \
               --nisserver=ns1.bos.redhat.com --krb5realm=REDHAT.COM \
               --krb5kdc=kerberos.bos.redhat.com \
               --krb5adminserver=kerberos.corp.redhat.com
2. Remove the default_realm setting from /etc/krb5.conf
3. Run authconfig-tui and step through every screen until it exits.
  
Actual results:
/etc/krb5.conf doesn't have a default_realm setting added to it.

Expected results:
It probably should have gotten one.

Additional info:
Jeff was actually the person who ran into this, so I'm CCing him.

Workaround - just run authconfig --updateall

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
In some cases, when multiple configuration files with the same configuration settings contained different configuration values for a setting, the configuration files contents were not properly synchronized with authconfig. With this update, the synchronization works as expected.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0595.html