[SUREFIRE-2279] Do dump files exist or not

**[Elliotte Rusty Harold](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=elharo)** opened **[SUREFIRE-2279](https://issues.apache.org/jira/browse/SUREFIRE-2279?redirect=false)** and commented

Error: Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.

If they exist print a more detailed message giving their paths. If they don't, don't print this message at all.

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No further details from [SUREFIRE-2279](https://issues.apache.org/jira/browse/SUREFIRE-2279?redirect=false)

Start by locating the code that emits the exact “Please refer to dump files” message, then inspect how dump files are detected. Done means existing dump files produce a detailed message containing their paths, while the generic message is omitted when no dump files exist.

Written by the indexing model from the issue text.