Updated version of VTN for virt edition.

This patch updated pom.xml of virtualization edition to use new version
of artifacts of VTN project.
 - VTN Coordinator: 5.1.1.0
 - VTN Manager    : 0.2.0

Change-Id: I60acafbbcc8c810d3fc22d7f0fff0d6119b9225b
Signed-off-by: Hideyuki Tai <h-tai@cd.jp.nec.com>