packaging: Used correct value in license tag in RPM .spec file as required by...

packaging: Used correct value in license tag in RPM .spec file as required by https://docs.google.com/spreadsheet/pub?key=0AqPp4y2wyQsbdGQ1V3pRRDg5NEpGVWpubzdRZ0tjUWc

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3533 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534