Prevent mqueue from implicitely becoming a bind mount with --ipc=host

Currently, when running a container with --ipc=host, if /dev/mqueue is
a standard directory on the hos the daemon will bind mount it allowing
the container to create/modify files on the host.

This commit forces /dev/mqueue to always be of type mqueue except when
the user explicitely requested something to be bind mounted to
/dev/mqueue.

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

container/container_unix.go

@@ -44,7 +44,6 @@ type Container struct {
 	HostnamePath    string
 	HostsPath       string
 	ShmPath         string
-	MqueuePath      string
 	ResolvConfPath  string
 	SeccompProfile  string
 }
@@ -577,15 +576,6 @@ func (container *Container) IpcMounts() []execdriver.Mount {
 			Propagation: volume.DefaultPropagationMode,
 		})
 	}
-	if !container.HasMountFor("/dev/mqueue") &&
-		container.MqueuePath != "" {
-		mounts = append(mounts, execdriver.Mount{
-			Source:      container.MqueuePath,
-			Destination: "/dev/mqueue",
-			Writable:    true,
-			Propagation: volume.DefaultPropagationMode,
-		})
-	}
 	return mounts
 }