Default password hash

[Dag-Erling Smørgrav]

The attached patch backports support for sha256 and sha512 hashes to
stable/7.  It is not an exact MFH because the sha code in head uses
stpncpy(), which is not present in stable/7's libc.

DES
-- 
Dag-Erling Smørgrav - des at des.no

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