Alternate implementation to support workers that are referenced by host names rather than by ip addresses#2593

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darindf wants to merge 2 commits intodask:mainfrom

Commits on Apr 2, 2019

Alternate implementation to support workers defined by hostnames that may resolve to different ip addresses during the worker lifespan.
darindf
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Commits on Apr 3, 2019

Don't throw error if worker is already added to the scheduler.
darindf
committed