Initial init script for preferences-service

This is a basic init script for the preferences-service.  It assumes the following defaults (and makes sure they exist) if the name of the script is "preferences-service":

- /etc/preferences-service
- /var/log/preferences-service
- /usr/share/lib/preferences-service
- /usr/share/lib/preferences-service/preferences-service.jar

All of the default options can be overridden with an /etc/sysconfig/preferences-service configuration file.

The script also depends on daemonize so that may need to be added as a dependency for the RPM.
@ChandraAddala, this has been added as part of JAVA_OPTS