Use only 3 parallel test processes
Use only 3 parallel test processes

When using 1C, all cores on a 72 core machine cause machine out of memory

MarkEWaite/git-plugin,jenkinsci/git-plugin,martinda/git-plugin,jenkinsci/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin,martinda/git-plugin,jenkinsci/git-plugin,martinda/git-plugin,MarkEWaite/git-plugin,MarkEWaite/git-plugin