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fix(config): respect --global, --package-lock-only

This corrects two things,

`--global` implies `--location=global` and `--package-lock-only` implies
`--package-lock`

It also introduces a new sandbox runner for testing purposes. it's not
the prettiest thing i've ever written, but it seems to do the job pretty
nicely and doesn't require keeping track of wild shenanigans everywhere.

Fixes #2747
Fixes #3572

PR-URL: https://github.com/npm/cli/pull/3684
Credit: @nlf
Close: #3684
Reviewed-by: @wraithgar

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