Update the CreateRCScript tool so that it provides the ability to specify the
user that the server should run as (invoked via "su"), and also lets the user
specify the JAVA_HOME and JAVA_ARGS settings that should be used.

This also updates the start-ds and stop-ds commands to support a --quiet
argument, which causes them to not generate any output.  The generated RC
script uses this option, since server startup output shouldn't be generated at
system boot time.