Full remove usecplugin from distribution

usecplugin has wrong feature POM file invoking other projects
bundles and config files. This obviously generates issues in the
distribution-check job of other projects like openflowplugin.

Change-Id: I4bb4aa218ddd9f664200c705aa694f18016916a6
Signed-off-by: Luis Gomez <ecelgp@gmail.com>