Sync re-encrypted passwords with central

[gonzaloriestra]

Related to https://github.com/CartoDB/support/issues/2043

[gonzaloriestra]

Acceptance:

1. Create a dedicated instance in staging
2. ssh to central in staging
3. Open a rails console:

user = User.where(username: 'your-username').first
user.crypted_password = 'e4c2a6d7d41e6170470a9d1d3234bdcbc1b95018'
user.salt = '98dffcb748fc487987af5774ec3aab2d106e8578'
user.save

4. Log in with the password location
5. Go back to the console and check that the crypted_password starts with $argon2:

user.reload.crypted_password

[oleurud]

Acceptance 🍏