syncbase: Test that Destroy() isn't prevented by restrictive child ACL.
syncbase: Test that Destroy() isn't prevented by restrictive child ACL.

If there are no syncgroups in a hierarchy, Destroy() should ignore ACLs
on children.

Change-Id: I173bc7d4699059ee3a8ecf5906a4b5541fad9ab5

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref