Follow up ioredis client switch

[XVincentX]

Interesting followups:

ioredis

• [ ] Take advantage of transparent key prefixing so we can remove some boilerplate code

• [ ] Scan commands can return a stream — it is a great idea in order to avoid killing the server (both redis and the gateway)

• [ ] Cluster support. This is a different connection object with a different set of connection options as well.

ioredis-mock

• [x] Re—enable the db.test.js test that was checking certificate files. That should not be that hard.

• [x] Continuously track ioredis-mock for argument/reply transformer support here: https://github.com/stipsan/ioredis-mock/issues/322. We cut a corner to make it happen and we should repay the debt once the main library will be fixed.

[stipsan]

New release with transformers support just got pushed https://github.com/stipsan/ioredis-mock/releases/tag/v3.4.0