Merge pull request #1491 from coreos/release-0.22.0 #18

Job	Run time
Lints, pinned toolchain (x86_64)	1m 39s
Docs	1m 56s
Lints, pinned toolchain (s390x)	16m 59s
Tests, minimum supported toolchain (x86_64)	3m 1s
Tests, minimum supported toolchain (s390x)	27m 41s
Tests, unstable toolchain (beta, x86_64)	3m 5s
Tests, stable toolchain (x86_64)	3m 20s
Tests, unstable toolchain (nightly, x86_64)	3m 7s
Tests, stable toolchain (s390x)	27m 58s
	1h 28m 46s

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