Changes according to the latest [OWASP cheat sheet for secure Password Storage](https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pbkdf2):
- Changed default password hashing algorithm from pbkdf2-sha256 to pbkdf2-sha512
- Increased number of hash iterations for pbkdf2-sha1 from 20.000 to 1.300.000
- Increased number of hash iterations for pbkdf2-sha256 from 27.500 to 600.000
- Increased number of hash iterations for pbkdf2-sha512 from 30.000 to 210.000
- Adapt PasswordHashingTest to new defaults
- The test testBenchmarkPasswordHashingConfigurations can be used to compare the different hashing configurations.
- Document changes in changes document with note on performance and how
to keep the old behaviour.
- Log a warning at the first time when Pbkdf2PasswordHashProviderFactory is used directly
Fixes#16629
Signed-off-by: Thomas Darimont <thomas.darimont@googlemail.com>
