[MDEP-697] Specify file where bad dependency is found

**[Elliotte Rusty Harold](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=elharo)** opened **[MDEP-697](https://issues.apache.org/jira/browse/MDEP-697?redirect=false)** and commented

Typical output:

[WARNING] Used undeclared dependencies found:
[WARNING] xml-apis:xml-apis:jar:1.3.04:compile

This was from the maven-jxr plugin FWIW. However, this was a multi-module project and it wasn't immediately apparent which pom.xml had this issue. We should include that, possibly by file path, possibly by artifact coordinates

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No further details from [MDEP-697](https://issues.apache.org/jira/browse/MDEP-697?redirect=false)

Start by tracing where the “Used undeclared dependencies found” warning is generated for multi-module projects such as the maven-jxr plugin. Review how each pom.xml or artifact is represented during dependency analysis. Done means the warning identifies the pom.xml path or artifact coordinates containing the undeclared dependency.

Written by the indexing model from the issue text.