Replace ZkUtils, AdminUtils with Kafka AdminClient

[fr33m0nk]

Hi,

ZkUtils, AdminUtils were marked for Deprecation since the introduction of Kafka v2.0.0 It would be great if the dependency on ZkUtils, AdminUtils can be looked at as Kafka v2.4.1 removes these deprecated classes, which breaks gregor.

I can raise a PR for this issue though

[fr33m0nk]

I have raised the pull request with changes. It would be very helpful if this PR is looked at.

Thanks

[fr33m0nk]

On a deeper level of testing, it looks the changes require more rework. I will raise a PR later this weekend

[luhhujbb]

My pull request #9 should fix this issue.

[ccann]

Thanks folks, I will look at this ASAP