prevent pip to look for dependency during install (#4342)

Author: vepatel

tests/Dockerfile

@@ -11,7 +11,7 @@ RUN apt-get update \
 WORKDIR /workspace/tests
 
 COPY --link tests/requirements.txt /workspace/tests/
-RUN pip install --require-hashes -r requirements.txt
+RUN pip install --require-hashes -r requirements.txt --no-deps
 
 COPY --link deployments /workspace/deployments