library/roles/python-env/tasks/main.yml: Install a specific version of tornado to not break dependencies.

python-env/tasks/main.yml

@@ -31,6 +31,9 @@
       apt: pkg={{ item }} state=present
       with_items: '{{ py_env_pip_dev_packages }}'
 
+    - name: Install a specific version of tornado to avoid breaking dependencies
+      php: name=tornado version=4.1 state=present
+
     - name: Install the latest six python package
       #pip: name=six state=latest
       pip: name=six state=present