Cherry-pick #15668 to 7.x: Support application default credentials (ADC) for Google Pub/Sub#17789

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sayden wants to merge 1 commit intoelastic:7.xfrom sayden:backport_15668_7.x

+101-11

Commits on Apr 17, 2020

Support application default credentials (ADC) for Google Pub/Sub (elastic#15668 )

mwasilew2
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sayden
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