Implement runner for e2e tests (#548)

* implement a runner for e2e tests

* move e2e tests to a Docker container

* integrate e2e tests into build pipelines

* add tests for multi-namespace support and logical backup jobs

* @FxKu implement the first e2e test for failovers

e2e/Dockerfile

@@ -0,0 +1,22 @@
+FROM ubuntu:18.04
+LABEL maintainer="Team ACID @ Zalando <team-acid@zalando.de>"
+
+WORKDIR /e2e
+
+COPY manifests ./manifests
+COPY e2e/requirements.txt e2e/tests ./
+
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y \ 
+           python3 \
+           python3-setuptools \
+           python3-pip \
+           curl \
+    && pip3 install --no-cache-dir -r requirements.txt \
+    && curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/linux/amd64/kubectl \
+    && chmod +x ./kubectl \
+    && mv ./kubectl /usr/local/bin/kubectl \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+CMD ["python3", "-m", "unittest", "discover", "--start-directory", ".", "-v"]