installer/pkg/config-generator: Pass ignition config pointers

[wking]

Returning to the approach we used before 0e65a68 (#168) to save some copies. Spun off from this comment.

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[abhinavdahiya]

/assign @crawford

[wking]

Ah, the reason @crawford started copying instead of passing pointers is probably the different master ignition files (we don't want to append multiple times to the same config in this loop). We probably want to table this PR until we resolve #187.

/hold

[crawford]

Closed #187.

/close

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@crawford: Closing this PR.

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Closed #187.

/close

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