dump: Collect mount information on dump

For fanotify dumping we need to find mount points the path
lay on, moreover we save a mount point device number in the
image, thus collect mount point information on dump stage.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -1566,6 +1566,9 @@ int cr_dump_tasks(pid_t pid, const struct cr_options *opts)
 	if (collect_pstree(pid, opts))
 		goto err;
 
+	if (collect_mount_info())
+		goto err;
+
 	if (mntns_collect_root(root_item->pid.real))
 		goto err;