[430527] Use the always up-to-date share license

Use the shared org.eclipse.license feature from the CBI update-site at
http://download.eclipse.org/cbi/updates/license. This ensures we always
get the officiel up-to-date license text.

Bug: 430527
Change-Id: I51498a125a6b7b31319de0cef1a547ad5a7dd6b8
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>