[MNG-5513] Artifact filtering not updated for Eclipse Aether filtering

Artifact filtering was not updated when Aether swapped from Sonatype to Eclipse, causing it to be loaded by Plugin Class Realms and potentially leading to linkage problems.

Also, according to Benjamin, another import is needed in plugin Class Realm to restore Maven 3.0.x behaviour, due to package changes in Eclipse Aether.

Issue
http://jira.codehaus.org/browse/MNG-5513