pin versions

e2e/Dockerfile

@@ -7,7 +7,11 @@ 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 \
+    && apt-get install --no-install-recommends -y \ 
+           python3=3.6.7-1~18.04 \
+           python3-setuptools=39.0.1-2 \
+           python3-pip=9.0.1-2.3~ubuntu1 \
+           curl=7.58.0-2ubuntu3.7 \
     && 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 \

e2e/requirements.txt

@@ -1,3 +1,3 @@
 kubernetes==9.0.0
 timeout_decorator==0.4.1
-pyyaml
+pyyaml==5.1