The Client for Hello REEF example on standalone environment.
This can be run with the command: `java -cp lang/java/reef-examples/target/reef-examples-*-SNAPSHOT-shaded.jar
org.apache.reef.examples.hello.HelloREEFStandalone -nodelist ../NodeList.txt -port 22`
Here, we assume that the list of nodes is saved in the ../Nodelist.txt file, with each line containing ssh addresses
(i.e. `email@example.com`), and `~/.ssh/id_dsa` is set up on your local, with `~/.ssh/authorized_keys` containing
the contents of your `~/.ssh/id_dsa.pub`.
The port parameter is optional.