fix xpath for group_name

- use current()/owner_id when embedded in another context
- use explicit comparison count(...) != 0, since xpath doesn't do
  falsiness
Merge branch 'multimedia-case-properties+owner_name' into autostaging
Merge branch 'owner_name' into autostaging
Merge remote-tracking branch 'origin/cache-locations' into autostaging
Merge remote-tracking branch 'origin/hq-dropdown' into autostaging
Merge remote-tracking branch 'origin/refactor-domain-copy2' into autostaging
Merge remote-tracking branch 'origin/hqstyle-merge+vellum-requirejs' into autostaging
Merge remote-tracking branch 'origin/dynamic-links' into autostaging
Merge branch 'offline-install-multimedia' into autostaging
Merge remote-tracking branch 'origin/logos' into autostaging
Merge remote-tracking branch 'origin/109909-case-performance' into autostaging
Merge remote-tracking branch 'origin/switch_to_site_code' into autostaging
update submodule refs