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Merge pull request #1820 from bdemers/patch-1

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fix(contrib/coreos): bump etcd peer heartbeat to 500ms
Merge pull request #1831 from carmstrong/etcd_500

fix(contrib/coreos): bump etcd peer heartbeat to 500ms
fix(scheduler): handle announcer timeouts to work around https://github.com/docker/docker/issues/8022
Merge pull request #1832 from gabrtv/announcer-timeout

fix(scheduler): handle announcer timeouts explicitly
chore(*): bump CoreOS to 435.0.0; Docker to 1.2.0; fleet to 0.8.0