opendatacube / datacube-core / 6349

89%

develop: 89%

Pull #809

travis-ci

Improve start_local_dask interface

- Accept strings into `mem_safety_margin`
- Do the right thing for `memory_limit`, i.e. treat it as memory_limit for the
  whole cluster rather than per worker
- Use MEM_LIMIT environment variable when set (for jupyterhub users)
- refactor code for easier testing

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9129 of 10308 relevant lines covered (88.56%)

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