Initial api response time and hypervisor metrics

Dockerfile

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+FROM python:3.8
+RUN pip install pipenv
+RUN mkdir /python
+### CACHE PIP DEPENDENCIES
+COPY Pipfile* /tmp/
+RUN cd /tmp && pipenv lock --requirements > requirements.txt
+RUN pip install -r /tmp/requirements.txt
+###
+WORKDIR /python
+COPY . .
+CMD ["python", "/python/openstack_exporter.py"]