Cryptography crashes Py2.7, so avoid including it in CI

requirements/test-ci-default.txt

@@ -1,3 +1,4 @@
 -r test-ci-base.txt
--r extras/auth.txt
+#: Disabled for Cryptography crashing on 2.7 after interpreter shutdown.
+#-r extras/auth.txt
 -r extras/riak.txt