Merge pull request coreos#414 from cgag/fix-trailing-dots

kube-aws: don't append trailing dot to externalDNSName

Merge pull request coreos#386 from cgag/verbose-credential-errors

kube-aws: enable verbose credential chain errors

Merge pull request coreos#339 from coreos/fix-build-script-version

kube-aws: fix build script version flag

Merge pull request coreos#302 from aaronlevy/v1.1.8

k8s: bump version to v1.1.8

Merge pull request coreos#222 from iameli/spot-instances

kube-aws: add parameter for spot price