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catch 400 in kafka consumer group creation (#152)

* catch 400 in kafka consumer group creation

this 400 is because kafka consumer group creation doesn't need to happen
on clusters that have enough credentials to use any consumer group. We
don't need to error here

sample output:

```
$ heroku kafka:consumer-groups:create greetings; echo $?
Creating consumer group greetings... done
 ▸    kafka-REDACTED-36649 does not need consumer groups managed explicitly, so this command does nothing
0
```

* write test

7 of 7 new or added lines in 1 file covered. (100.0%)

534 of 602 relevant lines covered (88.7%)

5.23 hits per line