Change the way we determine if the host has a password set.
When creating a host with a password we don't set a Kerberos
principal or add the Kerberos objectclasses. Those get added when the
host is enrolled. If one passed in --password= (so no password) then
we incorrectly thought the user was in fact setting a password, so the
principal and objectclasses weren't updated.
https://fedorahosted.org/freeipa/ticket/4102