Require nothing less than MIT krb5 1.11.2
    
    Actually one feature requires the upstream master branch to be fully
    functional. In fedora this patch [1] has been backported to 1.11.2
    to have the full functionality available. Once upstream will release
    1.12 that will become the minimum reuirement.
    
    [1] https://github.com/krb5/krb5/commit/38cc076579888695a5820ceb44fe43020f5b61e1
    
    Signed-off-by: Simo Sorce <simo@redhat.com>