Merge pull request #1191 from justindowning/patch-1

pin ansible to version 2.2.1.0

requirements.txt

-ansible>=2.2.1
+ansible==2.2.1.0
 netaddr
 # Ansible 2.2.1 requires jinja2<2.9, see <https://github.com/ansible/ansible/blob/v2.2.1.0-1/setup.py#L25>,
 # but without explicit limiting upper jinja2 version here pip ignores