awscli: new package (#11796)

* awscli: new package

* More precise py-pyyaml version dep, as per setup.py

var/spack/repos/builtin/packages/awscli/package.py

+##############################################################################
+# 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 Awscli(PythonPackage):
+    """This package provides a unified command line interface to
+       Amazon Web Services"""
+
+    homepage = "https://pypi.org/project/awscli/"
+    url      = "https://pypi.io/packages/source/a/awscli/awscli-1.16.179.tar.gz"
+
+    version('1.16.179', sha256='6a87114d1325358d000abe22b2103baae7b91f053ff245b9fde33cb0affb5e4f')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-docutils@0.10:', type=('build', 'run'))
+    depends_on('py-colorama@0.2.5:0.3.9', type=('build', 'run'))
+    depends_on('py-rsa@3.1.2:3.5.0', type=('build', 'run'))
+    depends_on('py-pyyaml@3.10:3.13', type=('build', 'run'),
+               when='^python@2.6:2.6.99')
+    depends_on('py-pyyaml@3.10:5.1', type=('build', 'run'),
+               when='^python@2.7:')
+    depends_on('py-argparse@1.1:', when='^python@2.6:2.6.99',
+               type=('build', 'run'))
+    depends_on('py-s3transfer@0.2.0:0.2.999', type=('build', 'run'))
+    depends_on('py-botocore@1.12.169', type=('build', 'run'))
+    depends_on('py-nose', type='test')
+    depends_on('py-mock@1.3.0:', type='test')