detection of user password encryption from database, grant login desp…

[renaudlemaire]

Keeping password encrypted in md5 was an issue for a customer of us.
Here are small changes to grant login using password encryption from database and re-encrypt password using configured encryption

[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/66159

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[ywarnier]

Nice @renaudlemaire! Given the overhead at login time, I think it would be even nicer to put that under a configuration option (you can see how to define and use one here, for example: https://github.com/chamilo/chamilo-lms/pull/4041/files). Something like $_configuration['password_conversion'] = false; (we always set them to false in the definition, even though they're commented out).
Would you be up to add that additional change?

[renaudlemaire]

here it is