新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/docker/templates/daemon.json.j2

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+{
+  "exec-opts" : ["native.cgroupdriver=systemd"],
+  "log-level": "warn",
+  "log-driver": "json-file",
+  "log-opts": {
+    "max-size": "100m",
+    "max-file": "5"
+  },
+  "registry-mirrors": [
+    "https://dockerproxy.com",
+    "https://hub-mirror.c.163.com"
+  ],
+  "bip": "10.21.21.1/24",
+  "data-root": "{{ docker.dir.data }}",
+  "live-restore": true
+}

prometheus/roles/docker/templates/docker.service.j2

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+[Unit]
+Description=Docker Application Container Engine
+Documentation=https://docs.docker.com
+After=network-online.target firewalld.service
+Wants=network-online.target
+Requires=docker.socket
+
+[Service]
+Type=notify
+Environment=PATH={{ docker.dir.bin }}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+# the default is not to use systemd for cgroups because the delegate issues still
+# exists and systemd currently does not support the cgroup feature set required
+# for containers run by docker
+ExecStart={{ docker.dir.bin }}/dockerd -H unix://var/run/docker.sock
+ExecReload=/bin/kill -s HUP
+# Having non-zero Limit*s causes performance problems due to accounting overhead
+# in the kernel. We recommend using cgroups to do container-local accounting.
+LimitNOFILE=infinity
+LimitNPROC=infinity
+LimitCORE=infinity
+# Uncomment TasksMax if your systemd version supports it.
+# Only systemd 226 and above support this version.
+#TasksMax=infinity
+TimeoutStartSec=0
+# set delegate yes so that systemd does not reset the cgroups of docker containers
+Delegate=yes
+# kill only the docker process, not all processes in the cgroup
+KillMode=process
+# restart the docker process if it exits prematurely
+Restart=on-failure
+StartLimitBurst=3
+StartLimitInterval=60s
+
+[Install]
+WantedBy=multi-user.target
+

prometheus/roles/docker/templates/docker.socket.j2

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+[Unit]
+Description=Docker Socket for the API
+PartOf=docker.service
+
+[Socket]
+ListenStream=/var/run/docker.sock
+SocketMode=0660
+SocketUser=root
+SocketGroup=docker
+
+[Install]
+WantedBy=sockets.target
+