Ensure fetcher authorization delays support stop callbacks. #368

Job	Run time
pod-lib-lint (ios, Debug)	43m 31s
pod-lib-lint (ios, Debug)	13m 12s
pod-lib-lint (ios, Debug)	14m 4s
pod-lib-lint (ios, Release)	19m 23s
pod-lib-lint (ios, Release)	13m 8s
pod-lib-lint (ios, Release)	13m 8s
pod-lib-lint (macos, Debug)	9m 49s
pod-lib-lint (macos, Debug)	9m 49s
pod-lib-lint (macos, Debug)	9m 49s
pod-lib-lint (macos, Release)	11m 17s
pod-lib-lint (macos, Release)	11m 17s
pod-lib-lint (macos, Release)	11m 17s
pod-lib-lint (tvos, Debug)	10m 1s
pod-lib-lint (tvos, Debug)	10m 1s
pod-lib-lint (tvos, Debug)	10m 1s
pod-lib-lint (tvos, Release)	8m 21s
pod-lib-lint (tvos, Release)	8m 21s
pod-lib-lint (tvos, Release)	8m 21s
pod-lib-lint (watchos --skip-tests, Debug)	1m 38s
pod-lib-lint (watchos --skip-tests, Debug)	1m 38s
pod-lib-lint (watchos --skip-tests, Debug)	1m 38s
pod-lib-lint (watchos --skip-tests, Release)	1m 35s
pod-lib-lint (watchos --skip-tests, Release)	1m 35s
pod-lib-lint (watchos --skip-tests, Release)	1m 35s
	4h 4m 29s

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