Test in debian 9, ubuntu 14.04 and ubuntu 16.04

tests/dockerfiles/debian9/Dockerfile

@@ -0,0 +1,14 @@
+FROM debian:9
+
+RUN useradd -ms /bin/bash user
+
+RUN apt-get update && \
+    apt-get install -y \
+		curl \
+		gpg \
+		python \
+		sudo \
+		systemd \
+		&& rm -rf /var/lib/apt/lists/*
+
+CMD ["/bin/systemd"]