packaging:

 - added missing post install script in the rpm server sub-package
 - let "make install-server" delete the uuid from the config files (this was previously bundled into the build_release-packages.sh script

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@1338 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534