This needs a bit of coding since we can't do a simple match with the MONGODB-CR hash when it has been removed in the authSchemaUpgrade.

We will simply recompute the SCRAM storedKey using the iterationCount and salt of the user who is trying to log in.

Implementation note: simply make computeProperties public instead of static and call it with the pw, iterationCount and salt.

schwerin as it turns out we'll have to have a function taking the iteration count and salt like discussed before.