Bug#1076197: partman-crypto: x-initrd.attach option prints a warning message on boot

["David Härdeman" <david@hardeman.nu>]

Package: partman-crypto
Version: 125

After the fix for #1017542 was applied (version 125 of partman-crypto), a
warning message is printed on each boot on new installations. It's only
cosmetic, but it would still be nice if that warning could be removed...

boot message (from 125 onwards):

  cryptsetup: WARNING: <mapping>: ignoring unknown option 'x-initrd.attach'
  Please unlock disk <mapping>:

Cheers,
David