merged slurm_dockerimage back into slurm role

roles/slurm/files/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -e
+
+for i in /usr/local/lib/entrypoints.d/* ; do
+    [ -f $i ] && /bin/sh $i || break
+done
+
+exec "${@:-/bin/bash}"