krb5-libs-1.2.1-8 contains the files /etc/krb5.conf and /etc/rc.d.init.d/kdcrotate. So does krb5-configs-1.1.1-21. The -configs package seems to have been incorporated into krb5-libs. This results in a file conflict error when you try to upgrade from krb5-libs 1.1.1 to 1.2.1. Shouldn't krb5-libs obsolete krb5-configs?
It should, and I honestly thought that it did. Will be fixed in krb5-1.2.1-10, showing up in the next Raw Hide refresh and in http://people.redhat.com/nalin/krb5/ when it finishes building.