[MSHADE-388] Relocation in default package

**[Nico Mexis](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=hyperspeeed)** opened **[MSHADE-388](https://issues.apache.org/jira/browse/MSHADE-388?redirect=false)** and commented

The following attempt:
https://pastebin.com/fAbrPfS9
results in a jar file, which doesn't meet the standards.

I have tried different patterns already, but couldn't figure out any way of relocation specific packages into the default package. This seems like a bug.

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**Affects:** 3.2.4

Start with the linked Pastebin attempt and the Maven Shade Plugin's relocation behavior, then reproduce the reported JAR output. Compare it with the stated standards and determine whether relocating specific packages into the default package is supported; the issue is resolved when the resulting JAR meets those standards or the limitation is clearly established.

Written by the indexing model from the issue text.