Fix missing python libraries

Ansible reports:

```
Failed to import the required Python library (requests) on container's Python /usr/bin/python2.
```

This is due to missing libraries obviously as well as the fact that
ansible runs in python2 not python 3 on debian. Therefore this patch
rewrites the added lbiraries for influxdb and fixes the error message.

Dockerfile

@@ -10,6 +10,6 @@ RUN true \
     && apt-get update \
     && apt-get install -y software-properties-common \
     && apt-add-repository --yes --update ppa:ansible/ansible \
-    && apt-get install -y ansible python3-influxdb \
+    && apt-get install -y ansible python-requests python-influxdb \
     && apt-get clean && apt-get purge && rm -r /var/lib/apt/lists/* \
     && true