Improving handling of rename operation by user tracker, together with fixes for user tests, that failed as consequence. Failures were caused by RFE Kerberos principal alias. Some tests were rewritten, since they used "--setattr" option instead of "--rename", and hence didn't reflect proper behaviour of the principal aliases feature. https://fedorahosted.org/freeipa/ticket/6024 Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>