Retire the py-dev package (#8679)

var/spack/repos/builtin/packages/py-dev/__init__.py.patch

---- a/dev/__init__.py	2017-03-24 13:46:56.211385166 +0000
-+++ b/dev/__init__.py	2017-03-24 13:47:01.535332256 +0000
-@@ -1,6 +1,6 @@
- """
- 
--🚧 About
-+About
- --------
- 
- dev is a collection of Python developer tools presented as a

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

-##############################################################################
-# Copyright (c) 2013-2018, Lawrence Livermore National Security, LLC.
-# Produced at the Lawrence Livermore National Laboratory.
-#
-# This file is part of Spack.
-# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
-# LLNL-CODE-647188
-#
-# For details, see https://github.com/spack/spack
-# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License (as
-# published by the Free Software Foundation) version 2.1, February 1999.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
-# conditions of the GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-##############################################################################
-from spack import *
-
-
-class PyDev(PythonPackage):
-    """libraries and tools for Python development"""
-
-    homepage = "https://pypi.python.org/pypi/dev"
-    url      = "https://pypi.io/packages/source/d/dev/dev-0.4.0.tar.gz"
-
-    version('0.4.0', '00449cf0b347c32da9c840adcb4cf24b')
-
-    patch('__init__.py.patch')
-
-    depends_on('py-setuptools', type='build')