A forwardable ticket is still required but we no longer need to send
the TGT to the IPA server. A new flag, --delegate, is available if
the old behavior is required.
Set the minimum n-v-r for mod_auth_kerb and krb5-server to pick up
needed patches for S4U2Proxy to work.
https://fedorahosted.org/freeipa/ticket/1098https://fedorahosted.org/freeipa/ticket/2246