py-xattr: fix a package that was pointing to a fork (#13685)

The package now points to the official github repository for master
and to PyPI for release versions.

var/spack/repos/builtin/packages/py-xattr/package.py

@@ -3,17 +3,18 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from spack import *
-
 
 class PyXattr(PythonPackage):
     """A python interface to access extended file attributes,
-        sans libattr dependency"""
+    sans libattr dependency.
+    """
 
     homepage = "http://pyxattr.k1024.org/"
-    git      = "https://github.com/fwang2/pyxattr.git"
+    url = "https://pypi.io/packages/source/x/xattr/xattr-0.9.6.tar.gz"
+    git = "https://github.com/iustin/pyxattr.git"
 
-    version('develop', branch='dev')
+    version('master', branch='master')
+    version('0.9.6', sha256='7cb1b28eeab4fe99cc4350e831434142fce658f7d03f173ff7722144e6a47458')
 
     depends_on('python@2.7:')
     depends_on('py-setuptools', type='build')