Make it safe against wrong btrfs subvolumes on sles12 issue963 #966
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Now snapper's own subvolumes are excluded from being
automatically recreated by listing them only as comments in
disklayout.conf during "rear mkbackup" (via 23_filesystem_layout.sh)
and furthermore if such subvolumes are active in disklayout.conf
they are skipped during "rear recover" plus LogPrint info for the user
(via 13_include_mount_subvolumes_code.sh).