Cherry-pick #16667 to 7.6: Make memqueue.Broker internal (now memqueue.broker)#16684

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faec wants to merge 1 commit intoelastic:7.6from faec:backport_16667_7.6

+25-23

Commits on Feb 28, 2020

Make memqueue.Broker internal (now memqueue.broker) (elastic#16667 )
faec
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