Tracking iteration names changed to match iteration Python labels

https://twiki.cern.ch/twiki/bin/viewauth/CMS/TrackingIterationRenaming
That is why we need proper descriptions for pull requests. According to the current few words in this PR (including its name) it is a simple renaming. Is it also a bug fix? What are the expected consequences? If any - what kind of tests were done and where are the results from them?