Updates to debian init script
Updates to debian init script

 - support /etc/default/opentsdb
 - Add /usr/lib/default-java as a potential JDK path, this
   is commonly used as a symlink to the default jdk

Signed-off-by: Benoit Sigoure <d0ba46810740e35622837d76cd77ceb8c4bf46f5@gmail.com>

OpenTSDB/opentsdb,andyflury/opentsdb,MadDogTechnology/opentsdb,andyflury/opentsdb,johann8384/opentsdb,MadDogTechnology/opentsdb,ShefronYudy/opentsdb,alienth/opentsdb,eswdd/opentsdb,alienth/opentsdb,eswdd/opentsdb,johann8384/opentsdb,OpenTSDB/opentsdb,MadDogTechnology/opentsdb,OpenTSDB/opentsdb,ShefronYudy/opentsdb