Fix pep8 and py27 tests in Ubuntu Xenial

With the introduction of Ubuntu Xenial images, we are having issues
with pep8 and py27 tests, see
http://logs.openstack.org/78/330478/6/check/gate-packstack-pep8-ubuntu-xenial/1011cfa/console.html
for an example.

Since the cryptography version constraint was set to allow Nova to
work, I'm setting the same constraint here (!=1.3.0,>=1.0), which
seems to work as expected.

Change-Id: I2783bf9a7f32e11fdf661b18b2937d3420c6aa2d

requirements.txt

@@ -1,5 +1,5 @@
 netaddr>=0.7.6
 PyYAML>=3.10
 docutils>=0.11
-cryptography!=1.2.2,>=1.0
+cryptography!=1.3.0,>=1.0
 pyOpenSSL<15.0.0

setup.py

@@ -44,7 +44,7 @@ setup(
     long_description=read('README.md'),
     zip_safe=False,
     install_requires=['netaddr>=0.7.6', 'pyOpenSSL<15.0.0', 'PyYAML>=3.10',
-                      'docutils>=0.11', 'cryptography<=1.2.2,>=1.0'],
+                      'docutils>=0.11', 'cryptography!=1.3.0,>=1.0'],
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Topic :: Utilities",