No basic functions like keys, flushall

[aldayj-intific]

Hello, I did see that these commands are not in the list of supported commands, but they really should be.

we need to be able to empty the database without having to null it. I tried stopping and starting again, but that doesn't seem to work. I can't just reinstanciate the server because it's referenced, and reinstanciation would break the reference.

Please include keys and flushall command.

[erran]

@aldayj-intific this fork contains more commands for what it's worth: https://github.com/graknlabs/redis-mock/tree/164124f97236eac/src/main/java/ai/grakn/redismock/commands

[fppt]

Hi. My fork has support for more commands: https://github.com/fppt/jedis-mock