Fix CtnrUser creation failure in certain cases
Fix CtnrUser creation failure in certain cases

If the user was already in the 'global' container as a user or admin,
promoting them to superuser would succeed but adding them as a 'global'
admin would fail.

zeeman/cyder,akeym/cyder,akeym/cyder,OSU-Net/cyder,murrown/cyder,zeeman/cyder,murrown/cyder,zeeman/cyder,drkitty/cyder,drkitty/cyder,murrown/cyder,OSU-Net/cyder,drkitty/cyder,drkitty/cyder,akeym/cyder,OSU-Net/cyder,akeym/cyder,OSU-Net/cyder,zeeman/cyder,murrown/cyder