message: workaround for lack of timespec keyword python versions earlier than 3.6
diff: @@ -1373,7 +1373,7 @@ class Cluster(object):
  raise RuntimeError("Cluster already running.")
  cmd="%s -p %s -n %s -s %s -d %s -i %s -f --p2p-plugin bnet" % (
  - Utils.EosLauncherPath, pnodes, totalNodes, topo, delay, datetime.datetime.utcnow().isoformat(timespec='milliseconds') )
  + Utils.EosLauncherPath, pnodes, totalNodes, topo, delay, datetime.datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3])
  cmdArr=cmd.split()
  if self.staging:
  cmdArr.append("--nogen")
  