[New: openFATE 324961] enhance freezelink command

Feature added by: Ludwig Nussel (lnussel) Feature #324961, revision 1 Title: enhance freezelink command Buildservice: New Priority Requester: Desirable Requested by: Ludwig Nussel (lnussel) Partner organization: openSUSE.org Description: In order for the staging tool to avoid handling the frozen link itself, obs needs to provide more api calls * update all entries to current version * update or add only specific entries * create links only with a limited set of packages -- openSUSE Feature: https://features.opensuse.org/324961