Downgrade assertj to 2.1.0
Downgrade assertj to 2.1.0

ind9/metrics,mattnelson/metrics,wfxiang08/metrics,kevintvh/metrics,mt0803/metrics,bentatham/metrics,randomstatistic/metrics,signalfx/metrics,mspiegel/metrics,timezra/metrics,tempredirect/metrics,jplock/metrics,jasw/metrics,rexren/metrics,chenxianghua2014/metrics,AltitudeDigital/metrics,mtakaki/metrics,ChetnaChaudhari/metrics