[MNG-6222] Support exclusion of direct plugin dependencies

**[Robert Scholte](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rfscholte)** opened **[MNG-6222](https://issues.apache.org/jira/browse/MNG-6222?redirect=false)** and commented

Based on http://stackoverflow.com/questions/43630262/how-to-exclude-a-direct-dependency-of-a-maven-plugin

```xml

org.jvnet.jaxb2.maven2
maven-jaxb2-plugin
0.13.2

```

Up until now there hasn't been any reason to do this, but this seems like a valid one. Most clean solution I can think of is allowing to override the scope with "none" for plugin dependencies.

This solution won't break the pom-4.0.0.xsd

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25 votes, 27 watchers