Fixes #37614 - Use SHA512 for password hashing when no OS is set #10231
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In e2dee7d the default for new operating systems was changed to SHA512, but there's an edge case where no is know for a host that makes it use SHA256.
SHA512 has been the recommended value for hashing since EL5 and at least in EL6 it was also the default (didn't have EL5 on hand to check /etc/login.defs).