Save bcrypt password checks in local memory #6
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bcrypt is slow by design to protect passwords stored on disk.
So for increased performance, this PR caches the bcrypt checks in local memory of a given node instance.
We do not attempt to protect memory operations anyway.
https://security.stackexchange.com/questions/10520/is-it-safe-or-even-common-to-cache-bcrypt-checks-in-memory/10522#10522