Adding getConsumerGroupCoordinator and getting metadata working with commitOffset#12

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jamshidh wants to merge 4 commits intoadamflott:masterfrom

blockapps:master

Commits on May 22, 2020

Changing the version of commit/fetchOffset to use metadata
Jamshid
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Commits on May 26, 2020

Adding code to perform a GroupCoordinatorRequest, and modifying the OffsetCommitRequest to comply with the apiVersion=2
Jamshid
committed
Adding a function to get the Group Coordinator
Jamshid
committed
Running commit/fetchOffset at the correct machine.
Jamshid
committed