Use current username as default

Instead of russelb.  I mean, it's the user's fault they aren't
russelb, but I think this change follows the robustness principle.

Change-Id: I5a5b09836840220540980e6d0eb0e4d324dc2678
update core list to reflect recent changes

Change-Id: I532abf0d4d15a540660c976fb78a0aa78f34c0bd
Merge "Use current username as default"