Use mount package to unmount container stuff

Really these mounts shouldn't be in the container pacakge.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

container/container_linux.go

@@ -1,9 +0,0 @@
-package container // import "github.com/docker/docker/container"
-
-import (
-	"golang.org/x/sys/unix"
-)
-
-func detachMounted(path string) error {
-	return unix.Unmount(path, unix.MNT_DETACH)
-}

container/container_notlinux.go

@@ -1,23 +0,0 @@
-// +build freebsd
-
-package container // import "github.com/docker/docker/container"
-
-import (
-	"golang.org/x/sys/unix"
-)
-
-func detachMounted(path string) error {
-	// FreeBSD do not support the lazy unmount or MNT_DETACH feature.
-	// Therefore there are separate definitions for this.
-	return unix.Unmount(path, 0)
-}
-
-// SecretMounts returns the mounts for the secret path
-func (container *Container) SecretMounts() []Mount {
-	return nil
-}
-
-// UnmountSecrets unmounts the fs for secrets
-func (container *Container) UnmountSecrets() error {
-	return nil
-}

container/container_unix.go

@@ -1,4 +1,4 @@
-// +build linux freebsd
+// +build !windows
 
 package container // import "github.com/docker/docker/container"
 
@@ -380,7 +380,7 @@ func (container *Container) DetachAndUnmount(volumeEventLog func(name, action st
 	}
 
 	for _, mountPath := range mountPaths {
-		if err := detachMounted(mountPath); err != nil {
+		if err := mount.Unmount(mountPath); err != nil {
 			logrus.Warnf("%s unmountVolumes: Failed to do lazy umount fo volume '%s': %v", container.ID, mountPath, err)
 		}
 	}