Rust

Merge pull request #1294 from coreos/release-0.18.0 #2246

Job	Run time
Docs	4m 3s
Lints, pinned toolchain (x86_64)	3m 28s
Lints, pinned toolchain (s390x)	31m 56s
Tests, minimum supported toolchain (x86_64)	5m 5s
Tests, minimum supported toolchain (s390x)	49m 28s
Tests, unstable toolchain (beta, x86_64)	4m 28s
Tests, unstable toolchain (nightly, x86_64)	6m 14s
Tests, stable toolchain (x86_64)	4m 50s
Tests, stable toolchain (s390x)	46m 53s
	2h 36m 25s

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