The commit implements a mixin class providing capability
to track and modify kerberos principal aliases on supported
types of entries.
The class using the mixin must inherit from the Tracker class
and must provide the implementation of two methods:
* _make_add_alias_cmd
* _make_remove_alias_cmd
These are used to get the type specific command for the particular
entry class. The methods provided will not work on entries that
do not have 'krbprincipalname' attribute.
The service, host and user trackers are being extended to use this
new mixin class.
https://fedorahosted.org/freeipa/ticket/6142
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
5582d1df32