chpasswd and passwd write yescrypt ($y$) hashes, which the openssl $6$
comparison could not read: every re-run set the pxe password again, and a
box whose password was 'pxe' in yescrypt passed the pxe_admin_password
requirement. Both Admin tasks now compare with crypt(), which handles every
scheme. The config.img warning names the two Blancco versions instead of
the staging guard's merge instructions.
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