According to [this](http://karaf.922171.n3.nabble.com/compilation-failing-with-karaf-4-2-0-M2-td4052701.html) it looks like that Maven >= 3.3.x is needed for the `karaf-maven-plugin` which we use to validate the features can be installed. I'd suggest configuring the `maven-enforcer-plugin` in the jclouds-jaraf project to require such a Maven version and include the change in this PR. @andreaturli @gaul WDYT?
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