Don't read ipa.conf to get the realm, the kerberos libs do that for you.
Use the krbPrincipalName to change passwords
Make it possible to specify the principal at user creation.
Mail is not a required attribute so far, don't require it.
Add ipa-passwd tool
Add simple field validation package
This patch adds a package requirement, python-krbV. This is needed to
determine the current user based on their kerberos ticket.
