py-psycopg2: new package (#9926)

* py-psycopg2: new package

* Added dependency on py-setuptools, as the build will use it if present

var/spack/repos/builtin/packages/py-psycopg2/package.py

@@ -0,0 +1,18 @@
+# Copyright 2013-2018 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyPsycopg2(PythonPackage):
+    """Python interface to PostgreSQL databases"""
+
+    homepage = "http://initd.org/psycopg/"
+    url = "http://initd.org/psycopg/tarballs/PSYCOPG-2-7/psycopg2-2.7.5.tar.gz"
+
+    version('2.7.5', '9e7d6f695fc7f8d1c42a7905449246c9')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('postgresql', type=('build', 'run'))