TESTS: replace old test suite with the new one

get rid of Bats definitively

test/requirements/README.md

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+This directory contains resources to build Docker images tests depend on
+
+# Build images
+
+    ./build.sh   
+
+
+# python-requirements.txt
+
+If you want to run the test suite from your computer, you need python and a few python modules.
+The _python-requirements.txt_ file describes the python modules required. To install them, use
+pip:
+
+    pip install -r python-requirements.txt
+
+If you don't want to run the test from your computer, you can run the tests from a docker container, see the _pytest.sh_ script.
+
+
+# Images
+
+## web
+
+This container will run one or many webservers, each of them listening on a single port.
+
+Ports are specified using the `WEB_PORTS` environment variable:
+
+    docker run -d -e WEB_PORTS=80 web  # will create a container running one webserver listening on port 80
+    docker run -d -e WEB_PORTS="80 81" web  # will create a container running two webservers, one listening on port 80 and a second one listening on port 81
+
+The webserver answers on two paths:
+
+- `/headers`
+- `/port`
+
+```
+$ docker run -d -e WEB_PORTS=80 -p 80:80 web
+$ curl http://127.0.0.1:80/headers
+Host: 127.0.0.1
+User-Agent: curl/7.47.0
+Accept: */*
+
+$ curl http://127.0.0.1:80/port
+answer from port 80
+
+```
+
+
+## nginx-proxy-tester
+
+This is an optional requirement which is usefull if you cannot (or don't want to) install pytest and its requirements on your computer. In this case, you can use the `nginx-proxy-tester` docker image to run the test suite from a Docker container.
+
+To use this image, it is mandatory to run the container using the `pytest.sh` shell script. The script will build the image and run a container from it with the appropriate volumes and settings.