Updating 1.9 navigation

[zacharysarah]

This PR fixes some 1.9 navigation elements overlooked by #9071:

• Propagates fixes to .travis.yml added in fix version navigation in release v1.8 #9357
• Removes 1.6 navigation to comply with the docs standard of current+4

[k8sio-netlify-preview-bot]

Deploy preview for k8sio-v1-9 ready!

Built with commit 10b7956

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[zacharysarah]

See #9357 (comment) for discussion about Travis failing.

[tengqm]

This looks like the same problem #9423 is fixing.

[zacharysarah]

@tengqm It is, for release-1.9. Do I need to update this PR with the fix from #9423?

[tengqm]

@zacharysarah At least the k8s.io/kubernetes/pkg/scheduler/api/latest path needs a change. It has been relocated upstream.

[tengqm]

@zacharysarah Please try modify line 52 of test/examples_test.go from
schedulerapilatest "k8s.io/kubernetes/pkg/scheduler/api/latest"
to
schedulerapilatest "k8s.io/kubernetes/plugin/pkg/scheduler/api/latest"

[zacharysarah]

@tengqm I changed too many things in examples_test.go at once--I'll regress and try them one at a time.

UPDATE: Actually, before I do anything else, here's what I did: I imported the changes to examples_test.go from #9423. Here's the output:

package k8s.io/kubernetes/pkg/api/validation: cannot find package "k8s.io/kubernetes/pkg/api/validation" in any of:
	/home/travis/.gimme/versions/go1.8.3.linux.amd64/src/k8s.io/kubernetes/pkg/api/validation (from $GOROOT)
	/home/travis/gopath/src/k8s.io/kubernetes/pkg/api/validation (from $GOPATH)

The command "go get -t -v k8s.io/website/test" failed and exited with 1 during .

[zacharysarah]

@tengqm Looks like you fixed it! Feel free to lgtm/approve if you like it otherwise. 👍

[tengqm]

/lgtm
/approve

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