Minor Fixes: declarative-linking, versions, copyrights

 - declarative-linking example
 - added declarative-linking extension module into bom
 - 2.6-SNAPSHOT -> 2.7-SNAPSHOT in few modules (+ added these modules into parent's module list)

Change-Id: Ie048168fa08f6a854315a0d892d2e91f965bea3b
Signed-off-by: Michal Gajdos <michal.gajdos@oracle.com>