Reset of election version is 1 and not 0 apparently
Remove use of non-versioned voting
Removed backward compatibility test
Do rolling upgrade from 2.1.2, not 2.0.3
Centralized jetty thread calc, reduced default
Leads to a performance imporvement due to less GC time, at least on some configurations, can probably be tweaked further. Calcultion is based on what "feels right" to Johan.
Remove unused core poll
Merge pull request #2611 from ragadeeshu/jettythreads

Centralised jetty thread calculation, reduced default number of threads
Merge pull request #2602 from rickardoberg/removenonversionedelections

Remove non-versioned elections
Merge branch 'master' into 2.2-future