Make perf test more robust by persisting DB before killing container
Make perf test more robust by persisting DB before killing container

Symptom was that if test case was starting a node from exported
container with pre-mined chain without starting miner then node
sometimes was not having the height identified (that seemed compatible
with DB not flushed to disk yet).

aeternity/epoch,aeternity/epoch,aeternity/epoch,aeternity/epoch