roles/docker: Install and set up Docker daemon

The *docker* role configures the Docker daemon on the managed machine.

roles/docker/files/reset-docker-storage.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+: ${DOCKER_SVC:=${1:-docker}}
+
+
+systemctl stop ${DOCKER_SVC} ${DOCKER_SVC}-storage-setup
+
+docker_pool=$(/sbin/lvm lvs | awk '$1=="docker-pool"{printf "%s/%s\n",$2,$1}')
+if [ -n "${docker_pool}" ]; then
+	/sbin/lvm lvchange -an "${docker_pool}"
+	/sbin/lvm lvremove "${docker_pool}"
+fi
+
+rm -f /etc/sysconfig/${DOCKER_SVC}-storage
+
+find /var/lib/docker -mindepth 1 -delete