Don't create source directory while the daemon is being shutdown, fix #30348

If a container mount the socket the daemon is listening on into
container while the daemon is being shutdown, the socket will
not exist on the host, then daemon will assume it's a directory
and create it on the host, this will cause the daemon can't start
next time.

fix issue https://github.com/moby/moby/issues/30348

To reproduce this issue, you can add following code

```
--- a/daemon/oci_linux.go
+++ b/daemon/oci_linux.go
@@ -8,6 +8,7 @@ import (
        "sort"
        "strconv"
        "strings"
+       "time"

        "github.com/Sirupsen/logrus"
        "github.com/docker/docker/container"
@@ -666,7 +667,8 @@ func (daemon *Daemon) createSpec(c *container.Container) (*libcontainerd.Spec, e
        if err := daemon.setupIpcDirs(c); err != nil {
                return nil, err
        }
-
+       fmt.Printf("===please stop the daemon===\n")
+       time.Sleep(time.Second * 2)
        ms, err := daemon.setupMounts(c)
        if err != nil {
                return nil, err

```

step1 run a container which has `--restart always` and `-v /var/run/docker.sock:/sock`
```
$ docker run -ti --restart always -v /var/run/docker.sock:/sock busybox
/ #

```
step2 exit the the container
```
/ # exit
```
and kill the daemon when you see
```
===please stop the daemon===
```
in the daemon log

The daemon can't restart again and fail with `can't create unix socket /var/run/docker.sock: is a directory`.

Signed-off-by: Lei Jitang <leijitang@huawei.com>

(cherry picked from commit 7318eba5b2f8bb4b867ca943c3229260ca98a3bc)

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

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

components/engine/cmd/dockerd/daemon.go

@@ -155,6 +155,8 @@ func (cli *DaemonCli) start(opts daemonOptions) (err error) {
 	api := apiserver.New(serverConfig)
 	cli.api = api
 
+	var hosts []string
+
 	for i := 0; i < len(cli.Config.Hosts); i++ {
 		var err error
 		if cli.Config.Hosts[i], err = dopts.ParseHost(cli.Config.TLS, cli.Config.Hosts[i]); err != nil {
@@ -186,6 +188,7 @@ func (cli *DaemonCli) start(opts daemonOptions) (err error) {
 			}
 		}
 		logrus.Debugf("Listener created for HTTP on %s (%s)", proto, addr)
+		hosts = append(hosts, protoAddrParts[1])
 		api.Accept(addr, ls...)
 	}
 
@@ -213,6 +216,8 @@ func (cli *DaemonCli) start(opts daemonOptions) (err error) {
 		return fmt.Errorf("Error starting daemon: %v", err)
 	}
 
+	d.StoreHosts(hosts)
+
 	// validate after NewDaemon has restored enabled plugins. Dont change order.
 	if err := validateAuthzPlugins(cli.Config.AuthorizationPlugins, pluginStore); err != nil {
 		return fmt.Errorf("Error validating authorization plugin: %v", err)