Mark 1.7.0 kops version

Merge commit '8ea648b71' into release-1.7

Merge pull request kubernetes#2880 from justinsb/tag_17_alpha1

Bump dns-controller & kops for 1.7.0-alpha.1

Release 1.6.2

Version 1.6.1

Update version to 1.6.0

Merge pull request kubernetes#2479 from justinsb/tag_160_beta1

Update tests for version bump

Update makefile to 1.6.0-alpha.2

Merge pull request kubernetes#2238 from justinsb/release_160_alpha1

Version updates for 1.6.0-alpha.1

Tag release 1.5.3

Undo the cherry pick of the kubelet version bump, which should not have
been on this branch.

We'll skip 1.5.2