XD-110

Use XD_HOME environment property
 if XD_HOME is not defined already, then use the default APP_HOME that the script runs from
Please note:  if container is invoked directly without scripts, then relative path is set (via RedisContainerLauncher) for xd home
Merge pull request #31 from ilayaperumalg/XD-110

* ilayaperumalg-xd-110:
  XD-110