I'm about to refactor the code which includes the Kubernetes support in a way
which relies on something vendoring `./cli/context/kubernetes/` in order to
trigger the inclusion of support for the Kubernetes endpoint in the final
binary.
In practice anything which is interested in Kubernetes must import that package
(e.g. `./cli/command/context.list` does for the `EndpointFromContext`
function). However if it was somehow possible to build without that import then
the `KUBERNETES ENDPOINT` column would be mysteriously empty.
Out of an abundance of caution add a specific check on the final binary.
Signed-off-by: Ian Campbell <ijc@docker.com>
Ian Campbell