Improved logging in scheduler.log

Current Situation

Unfortunally the log4j configuration suppresses some infos/errors.
Now the java classes log to stdOut (ConsoleAppender).

• This configuration is ok for Java jobs because the JobScheduler collects the stdOut and write it into its main log.
• Some logging of Java classes from the JobScheduler get lost, particularly errors when the JobScheduler is loading the java subsystem.
  This concerns the following loggers:
  • com.sos.scheduler.engine.*
  • akka.*
  • spray.*

Desired Behaviour

The loggers

• com.sos.scheduler.engine.*
• akka.*
• spray.*

write into $SCHEDULER_DATA/logs/scheduler.log too