Add support for the upcoming Debian Stretch
*Created by: xmaysonnave* While installing **ansible-openwisp2** on **Debian Stretch RC1** I face an *uwsgi* crash as ansible fetched uwsgi 2.0.14 from the PyPi repo. The crash is related to an *OpenSSL 1.1* incompatibility. However while digging and experimenting, Debian successfully installed uwsgi from its own repo. In order to have a functionnal installation I modified the file : `/etc/ansible/roles/openwisp.openwisp2/tasks/pip.yml` with the following informations : ``` - name: Install uwsgi pip: name: http://http.debian.net/debian/pool/main/u/uwsgi/uwsgi_2.0.14+20170111.orig.tar.gz state: latest virtualenv: "{{ virtualenv_path }}" virtualenv_python: "{{ openwisp2_python }}" virtualenv_site_packages: yes with_items: - uwsgi notify: reload supervisor ``` That way pip fetch, build and doesn't complain. Thanks
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