REGISTRAR: fixed behavior for group applications with auto-approve

- Do not try to (auto-)approve applications for group when user is not member of VO.

- When VO admin approves VO application, then try to approve all user's group
  applications with auto-approve mode (search by user-ext-source too, to get 
  all applications of user which was submited before user creation). Skip NEW
  applications, they will be approved once user