Bug 451961 - Update maven-dependency-plugin in eclipse.platform.common 

Updating to version 2.9 will give the number of fixes/improvements from
http://jira.codehaus.org/secure/ReleaseNote.jspa?projectId=11214&version=19229
. The most noticable one is http://jira.codehaus.org/browse/MDEP-439
which fixes the plugin to work properly under Java 8.

Change-Id: Icd19de999b4c81821300bd8559454ef676938f95
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>