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Switch hastctl and hastd to libmd instead of openssl for sha256

Description

Switch hastctl and hastd to libmd instead of openssl for sha256

Reviewed by: bapt, brnrd, pjd
Approved by: pjd (maintainer)
Sponsored by: ScaleEngine Inc., FOSDEM DevSummit
Differential Revision: https://reviews.freebsd.org/D9423