Revert "upgrade plexus metadata generator"

This reverts commit f8e0a5e2acd6aa0ac3a32ddfa0e44f17584f5e32. The change
was causing significant differences in the way that the components were
resolved, and failing to load the proper vendor information. This can be
investgated at a later time, but for now the solution to the original
problem turned out to be different anyway.

git-svn-id: https://svn.apache.org/repos/asf/incubator/npanday/trunk@1609038 13f79535-47bb-0310-9956-ffa450edef68