Add a fail fast option to validate_password().

[Parth Verma]

Right now, the validate_password function runs all the validators in the list. However, while implementing something like a validator to prevent password reuse, we might want the user to resolve all the other validation errors before running an expensive DB operation. Adding a fail fast option might be helpful here as it will allow to resolve validation errors as they appear rather than running all the validators again everytime.

[Mariusz Felisiak]

Thanks for this ticket, however it looks quite niche. In most of cases it's preferable to return all validation errors to users, without unnecessary round-trip. You can always pass the password_validators argument in your own code to fail-fast on non-expensive validators, e.g.

validate_password(password, user, password_validators=non-db-validators)
validate_password(password, user, password_validators=expensive-db-validators)