[release] Prepare XE 1.7 release.
[release] Prepare XE 1.7 release.

git-svn-id: cf27bad30c6b7316185bdac65b014e8c16cd40b6@14687 f329d543-caf0-0310-9063-dda96c69346f

xwiki/xwiki-enterprise,xwiki/xwiki-enterprise