Fix coordinator goroutine tight loop on cancelled context (backport #229)

[mergify]

This is an automatic backport of pull request #229 done by Mergify.

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[elasticmachine]

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Build stats

• Build Cause: Pull request #230 opened

• Start Time: 2021-04-13T19:27:30.403+0000

• Duration: 13 min 6 sec

• Commit: 2012c74

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Test	Results
Failed	0
Passed	69
Skipped	0
Total	69

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