test_pickling: explicitly close the cloned FS when finished
test_pickling: explicitly close the cloned FS when finished


git-svn-id: 8cb283e029ccc584ee033bc60e9dde2ebb13e534@168 67cdc799-7952-0410-af00-57a81ceafa0f

atty303/pyfilesystem,lightkeeper/lspyfilesystem,lightkeeper/lspyfilesystem