packaging:

- postinstall_setup.sh sets configuration files to chmod 640 now and no longer 750.
- Improved setting the permissions for the truststore. Only directories will get the "x" bit now.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3491 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534