[MNG-7396] Allow specification of additional plugin-repositories in extensions.xml

**[Christoph Läubrich](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=laeubi)** opened **[MNG-7396](https://issues.apache.org/jira/browse/MNG-7396?redirect=false)** and commented

Currently the only way is a settings.xml and default activated profiles are even ignored see https://issues.apache.org/jira/browse/MNG-5984

I'd like to propose to allow specifying (additional) plugin repositories directly in the extensions.xml this would make it much clearer and flexible (e.g. in case one likes to use snapshots but don't want to force everyone to add / specify a settings.xml).

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**Attachments:**
- [testit.zip](https://issues.apache.org/jira/secure/attachment/13039302/testit.zip) (_962 bytes_)