packaging: Modified deploy_release-packages.sh file:

- Added support for new release testing subproject 'testing'.
- 'stable' releases are now automatically created in the respective
  subproject. The script exists if the subproject does not exist yet.


git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3089 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534