fs.expose.fuse: correctly report UnsupportedError for getxattr/listxattrs.
fs.expose.fuse: correctly report UnsupportedError for getxattr/listxattrs.

This fixes issue 104; thanks dmarkey


git-svn-id: 74b2def6592cf29d88d1a5d33b5c4a2732d8507c@752 67cdc799-7952-0410-af00-57a81ceafa0f

duedil-ltd/pyfilesystem,anthonybishopric/pyboxfs,alekibango/pyfilesystem,anthonybishopric/pyboxfs,alekibango/pyfilesystem,pscottdevos/pyfilesystem,pscottdevos/pyfilesystem