Do not lock network if running in the host network namespace

Related: https://github.com/checkpoint-restore/criu/issues/577

Restoring a runc container which is running in the host's network
namespace locked the network (iptables-restore) without unlocking it.

This disables network logging if running in the host's network
namespace.
Suggested-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

criu/cr-restore.c

@@ -2134,7 +2134,7 @@ static int restore_root_task(struct pstree_item *init)
 			goto out_kill;
 	}
 
-	if (opts.empty_ns & CLONE_NEWNET) {
+	if (root_ns_mask & opts.empty_ns & CLONE_NEWNET) {
 		/*
 		 * Local TCP connections were locked by network_lock_internal()
 		 * on dump and normally should have been C/R-ed by respectively