update compatibilty hack for property setters/deleters (py < 2.6) with a cleaner and more efficient version
update compatibilty hack for property setters/deleters (py < 2.6) with a cleaner and more efficient version

git-svn-id: 9f18dd852162ff6c59c5533c0914e9cf81af9e7c@1145 d8a29897-7e4b-0410-a74a-8bb4c295346f

tamentis/psutil,tamentis/psutil