Signed-off-by: Bart Verwilst <bart@verwilst.be>

when running `helm init --upgrade`, the entrypoint since v2.9.1 changed which
caused tiller to never start. Kubernetes may be holding onto the same entrypoint
during upgrades.

Closes #2311

Added make target
Lowered docker image sizes
Updated ruder.pb.go

Added dockerfiles for rudder service and tiller run with
--experimental-release flag

Still needs a dockerfile

/cc @michelleN

'-f' is depreciated

This fix supersedes #323. It applies basically the same fixes:

- local docker registries are now supported
- kubectl is not downloaded on every build

Also, added a fix for the case where `docker version` failed because the
Docker daemon crashed, and consequently spuriously propmted the user to
re-install docker.

I added support for $DOCKER_PROJECT instead of just $PROJECT because the
later is a little too generic for a shell env var. We can deprecate
$PROJECT later.

I did not add back in the better tool checks in bootstrap because
CircleCI doesn't have the `command` command.