Use Case

As a driver engineer,
I want to stop supporting callbacks in Kerberos,
So that all our codebases consistently only support promises.

User Experience

• Users should primarily be using kerberos through the driver, so they should be unimpacted.
• any user using kerberos directly must migrate to promises, or callbackify our API themselves.

Dependencies

• n/a

Risks/Unknowns

• Should we remove support for `MongoAuthProcess` as well in v7? If so, we do not need to promisify its API.

Acceptance Criteria

Implementation Requirements

• Remove MongoAuthProcess
• Remove Callback support from the following APIs (the only remaining publicly exported APIs):
  • initializeClient
  • initializeServer
  • principalDetails
  • checkPassword

Testing Requirements

• Refactor tests to use async-await instead of callbacks.
• Ensure all tests pass.

Documentation Requirements

• Update kerberos' API reference in README.md

Follow Up Requirements

• n/a