Merge pull request #3915 from sosiouxme/20170412-tox-nail-down-ansible

tox tests: pin test requirement versions

requirements.txt

@@ -1,6 +1,6 @@
-ansible>=2.2
-click
-pyOpenSSL
+ansible==2.2.2.0
+click==6.7
+pyOpenSSL==16.2.0
 # We need to disable ruamel.yaml for now because of test failures
 #ruamel.yaml
-six
+six==1.10.0