Store Change-Id in notedb

This adds a 'Change-id' footer to the commit message of the
refs/changes/XX/YYYY/meta notes branch when the change is created.

Tests which manually insert new changes must be adapted so that the
initial commit to the notes branch contains the Change-Id info.

Change-Id: I4a8fde3da5458afab69b39230a6db117fbef8ab9
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/server/change/ConsistencyCheckerIT.java

@@ -589,6 +589,7 @@ public class ConsistencyCheckerIT extends AbstractDaemonTest {
     ChangeUpdate u = changeUpdateFactory.create(
         changeControlFactory.controlFor(c, userFactory.create(adminId)));
     u.setBranch(c.getDest().get());
+    u.setChangeId(c.getKey().get());
     u.commit();
 
     return c;