Declare jacoco mavne plugin

This adds jacoco into dependencyManagement section, so projects pick the
global version as default and do not have to rely on the property.

Change-Id: Iaf2fb36d4aeb60725e20b91b1890c079ae12e86e
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Declare jacoco mavne plugin"