Update paramiko dependancy to be fixed at 1.17.0 due to paramiko updates.

Paramiko 2.0 changed the paramiko dependancy to require cryptography
which can cause issues with OpenCafe installations of the SSH plugin.

Change-Id: Ied6793e0a42e1d7de6a15db19e9883399d3301d6

cafe/plugins/ssh/setup.py

@@ -22,5 +22,5 @@ setup(
     url='http://rackspace.com',
     packages=find_packages(),
     namespace_packages=['cafe'],
-    install_requires=['paramiko'],
+    install_requires=['paramiko >= 1.17.0, <2'],
     zip_safe=False)