[VOTE] KIP-692: Make AdminClient value object constructors public

[Noa Resare]

Let’s kick of a vote for this tiny little KIP, that holds the promise of 
simplifying testing for code that calls the Kafka admin API:
https://cwiki.apache.org/confluence/display/KAFKA/KIP-692:+Make+AdminClient+value+object+constructors+public
 
<https://cwiki.apache.org/confluence/display/KAFKA/KIP-692:+Make+AdminClient+value+object+constructors+public>

Thanks,
Noa