Add systemd files, add containerd-proxy config

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

contrib/init/systemd/docker.service

@@ -0,0 +1,32 @@
+[Unit]
+Description=Docker Application Container Engine
+Documentation=https://docs.docker.com
+After=network-online.target firewalld.service containerd.service
+Wants=network-online.target containerd.service
+
+[Service]
+Type=notify
+# Install containerd-shim-process if it's not already installed
+ExecStartPre=/usr/libexec/containerd-offline-installer /var/lib/containerd/containerd-shim-process.tar docker.io/docker/containerd-shim-process
+ExecStart=/usr/bin/dockerd
+ExecReload=/bin/kill -s HUP $MAINPID
+# 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