This commit is updating hsmtool and exposesecrets to use the new pattern for storing the secret, which is the secret_data and secret_len, to support both 64 byte and 32 byte seeds.
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
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