Fix IT, further investigation required.
mvn help:evaluate -Dexpression=settings doesn't show proxies for Maven 3.0.1, 3.0.2, 3.0.3 and 3.0.4, but does for 2.2.1. So this looks like a core issue

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1441770 13f79535-47bb-0310-9956-ffa450edef68