+ SUBDIR.cpio.gz prevents files from SUBDIR/ to be copied when
priming the memory filesystems. This restores the old behaviour
and makes the copy process a lot more efficient
+ look for templates also in the list of directories supplied by
bootp/dhcp via the T134 option aka kern.bootp_cookie
+ keep track of directories temporarily mounted with "remount"
or "diskless_remount" commands and unmount them once we are done
with them (at the end of this script).
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