SAK-25727 fix license URL to point to opensource.org


git-svn-id: https://source.sakaiproject.org/svn/sakai/trunk@271433 66ffb92e-73f9-0310-93c1-f5514f145a0a
INFRSTR-255 update .externals to use core svn repos (not contrib)

git-svn-id: https://source.sakaiproject.org/svn/sakai/trunk@305949 66ffb92e-73f9-0310-93c1-f5514f145a0a