Enable additional java parameters for wls install

When using wls module with Docker, the installer
complain that there's not enough disk space. According
http://docs.oracle.com/cd/E24329_01/doc.1211/e26593/issues.htm#BCFIHGCJ
this check can be circumvented with -Dspace.detection=false.
Merge pull request #28 from jyrkiput/master

Enable additional java parameters for wls install