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Add explicit_bzero() to libstand, and switch GELIBoot to using it

Description

Add explicit_bzero() to libstand, and switch GELIBoot to using it

Make sure sensitive memory is properly cleared when finished with it

Reviewed by: Eric McCorkle <eric@metricspace.net>
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D9798

Details