Install curl and systemd in docker image

A few issues have popped up where the provided image doesn't have the required packages for certain health checking operations (like #584 (comment)).

This installs curl and systemd in the container to help alleviate these issues.

Author: com6056

Dockerfile

@@ -17,7 +17,7 @@ FROM ${BASEIMAGE}
 
 MAINTAINER Random Liu <[email protected]>
 
-RUN clean-install util-linux libsystemd0 bash
+RUN clean-install util-linux libsystemd0 bash curl systemd
 
 # Avoid symlink of /etc/localtime.
 RUN test -h /etc/localtime && rm -f /etc/localtime && cp /usr/share/zoneinfo/UTC /etc/localtime || true