Unify jacoco versions to 0.6.2.201302030002

This cleans up previously unused pluginManagement sections and bumps
jacoco version 0.6.2.201302030002 (previously used by config subsys).

Change-Id: I027b219e7fd0225fe2ef12cbdcc1f7d47509e993
Signed-off-by: Robert Varga <rovarga@cisco.com>
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>