Update deps to Kube 1.11.3

This updates the dependencies to Kube 1.11.3 to pull in a fix allowing
requestheader auth to be used without normal client auth (which makes
things work on clusters that don't enable client auth normally, like
EKS).

vendor/github.com/go-openapi/spec/.travis.yml

@@ -1,6 +1,8 @@
 language: go
 go:
 - 1.7
+- 1.8
+- 1.9
 install:
 - go get -u github.com/stretchr/testify
 - go get -u github.com/go-openapi/swag