* Add external service cnames
* remove cruft
* update CI k8s version
* change CI k8s version
* min k8s ver for ext services
* trying k8s 1.5
* k8s 1.5 requires ports spec
* remove kruft
* update dns schema version
Change the CI setup for K8s to be simpler. Now it just creates a
set of objects via a yaml file, making it very easy to modify
the tests.
Implement PTR for services.
This fix uses docker container for kubectl. Since Kubernetes docker
image hyperkube has already been downloaded and it consists of
kubectl, there is really no need to download kubectl binary again.
This fix cleans up the Kubernetes related travis setup and removes
unneeded scripts.
This fix also fixes several mismatches of the Kubernetes version used,
so that any changes in version in the future only need to update .travis.yml.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
