ditch master nightly tests but add official 5.2 and 5.3 nightlies.#81

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mattpolzin merged 2 commits intomasterfrom

add-swift-5.3-ci

Jun 25, 2020

Commits on Jun 25, 2020

ditch master nightly tests but add official 5.2 tests for focal, centos8, and amazonlinux and add nightlies for 5.3
mattpolzin
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remove unavailable images
mattpolzin
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