solver3: Merge Depends into Recommends

Merge any hard clauses into optional clauses, such that
optional clauses don't end up with more choices.

For example if you have

    Depends: a | b
    Recommends: a | c

This becomes:

    Depends: a | b
    Recommends: a

We have simulated this with the chaos-actor in the test case
and a

    Depends: git (not satisfied by chaos provider)
    Recommends: git (satisfied by chaos provider)

and the latter constraint is limited to the former.

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