Speed up stopping of nodes in tests by splitting up stop and wait (#2587)
Speed up stopping of nodes in tests by splitting up stop and wait (#2587)

Especially speed up MN based tests which currently spend multiple seconds
waiting for nodes to stop.
nmarley/dash,UdjinM6/dash,dashpay/dash,ionomy/ion,dashpay/dash,dashpay/dash,nmarley/dash,nmarley/dash,ionomy/ion,thelazier/dash,nmarley/dash,thelazier/dash,ionomy/ion,UdjinM6/dash,ionomy/ion,thelazier/dash,UdjinM6/dash,UdjinM6/dash,nmarley/dash,nmarley/dash,dashpay/dash,ionomy/ion,ionomy/ion,UdjinM6/dash,thelazier/dash,thelazier/dash,nmarley/dash,dashpay/dash