Switch to asynchronous loggers

Current Situation

• Controller and Agents make use of asynchronous loggers and apply the following properties

  sys.props("log4j2.contextSelector") =
    classOf[org.apache.logging.log4j.core.async.AsyncLoggerContextSelector].getName
  // Use less CPU when idling than default "Timeout":
  sys.props("log4j2.asyncLoggerWaitStrategy") = "Block"
  // Because AsyncLoggerContextSelector flushes:
  sys.props("js7.log4j.immediateFlush") = "false"
  

• JOC Cockpit makes use of synchronous loggers

Desired Behavior

• JOC Cockpit will switch to use of asynchronous loggers similarly to Controller and Agent.