eipp: output at most two versions per package

We can trim generation time and size of the EIPP scenario considerable
if we we avoid telling the planers about "uninteresting" packages.

This is one of the simpler but already very effective reductions:
Do not tell planers about versions which are neither installed nor are
to be installed as they have no effect on the plan we don't need to tell
the planer about them. EDSP solvers need to know about all versions for
better choice and error messages, but planers really don't.

Git-Dch: Ignore

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