There have been problems with centos7 lately with py2/py3.
Ansible's pip module used python2 instead of python3 for
creating virtual venv which lead to dependency issues with
infrared which should be installed only by py3.
This changes also bumps the linters, removing yamllint which is now
included in ansible-lint.
Change-Id: If117b438fd55b17ead4016aabc3feae6632e722b