docker/docker-ce: uprev to 18.09

Infrastructure changes triggered updated to supporting parts of the
docker stack, so to make sure that everything stays in sync we update
to the 18.09 release.

There were some minor build differences in this update, but in the
end, things are better since we can use some more of the Make infrastructure
versus calling 'go build' directly.

Also, docker-ce and docker are now virtually the same, except for the
moby based docker pulling in the cli and libnetwork repos independently.
There should be virtually no difference between the results, but we still
keep the two variants for flexibility.

We also drop the unused/legacy 'hi.Dockerfile'.

Tested with both kubernetes and docker unit tests.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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