[MNG-6869] New flag to verify the status

**[Robert Scholte](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rfscholte)** opened **[MNG-6869](https://issues.apache.org/jira/browse/MNG-6869?redirect=false)** and commented

While working on INFRA-19861 we had issues with invalid changes in the settings.xml.
This was detected too late. After installation `mvn --version` is called, but it will only show the version of Maven.
It would be better to have a flag that verifies it a bit more:
- can Maven read/write to the local repository
- can Maven access all predefined repositories? (does the proxy work?)
This gives a much better feedback if Maven can do its job.

Current workaround: call something like `mvn help:evaluate -Dexpression=settings.localRepository -q -DforceStdout`

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**Issue Links:**
- [MNG-7075](https://issues.apache.org/jira/browse/MNG-7075) mvnDebug should only enter debug mode if not an informative or encryption switch has been passed

**Remote Links:**
- [GitHub Pull Request #995
](https://github.com/apache/maven/pull/995)

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