[spark] Fix class not found #10
[spark] Fix class not found #10

- need to add JAVA_HOME like hadoop
- also need to upload the config file to all instances, this should be
  done automatically, maybe use ansible, currently I just ssh into
every server and do it by hand
- [ ] FIXME: the address in Web-UI is wrong, I think this have to do
  with network config

at15/hadoop-spark-perf,at15/hadoop-spark-perf,at15/hadoop-spark-perf,at15/hadoop-spark-perf