[MDEP-525] Dependency:analyze-only complains about unused dependency on super class

**[Eugene Rubanov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=venikkin)** opened **[MDEP-525](https://issues.apache.org/jira/browse/MDEP-525?redirect=false)** and commented

Dependence:analyze-only complains about unused dependency on super class artifact when
* superclass and subclass package are in separate artifacts
* subclass is used explicitly in target maven module
* superclass is used only by subclass internals

In this case java compiler requires superclass to be provided during compilation, but dependency plugin reports superclass package as unused.
Please look at following example: https://github.com/venikkin/mdp-issue

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**Affects:** 2.10

Start with the linked mdp-issue reproducer and the dependency:analyze-only goal, then trace how the plugin evaluates superclass usage across separate artifacts. Done means the superclass dependency required for compilation is no longer falsely reported as unused, while genuinely unused dependencies remain detectable.

Written by the indexing model from the issue text.