caching_sha2_password: Add scramble generation for fast authentication #1328
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What problem does this PR solve?
This adds scramble generation that is used for the "fast authentication" part of
caching_sha2_password.Related to pingcap/tidb#9411
See also https://dev.mysql.com/doc/dev/mysql-server/latest/page_caching_sha2_authentication_exchanges.html
What is changed and how it works?
Check List
Tests