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postfix_null: Use fixed amount of rounds for password_hash

Christian Heusel requested to merge set-password_hash-rounds into master

As it turns out the value for this filters "rounds" parameter strongly differs depending on the installed python crypto backend, since python-crypt uses 5000 rounds while python-passlib uses 535000 rounds set a default parameter according to ansible documentation.

As really high values for "rounds" lead to some login timeouts it makes sense for us to use a fixed value for this parameter. In this case 5000 have been chosen as this value reflects the defaults from python-crypt aswell as /etc/login.defs in the shadow package.

Link: https://github.com/ansible/ansible/pull/77963/files
Related-to: #250
Signed-off-by: Christian Heusel christian@heusel.eu

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