Provide default images and volume mounts to user-provided init containers #1022
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This makes the user-provided init containers run after our built-ins,
meaning the user-provided init containers gets the final say on what
the environment is going to look like.
It defaults the init container image to the ES container image for convenience.
The Volume mounts for the ES container is appended to the init containers
volume mounts, with the result being that a simple init container will
run in the same context as Elasticsearch (with a notable exception of
environment variables)
This change facilitates use cases such as installing custom plugins:
TODO (to file issue upon merging)