* devel-2.4:
  RPC/Backend: Make UploadFile uid and gid agnostic
  Resolve uid/gid upon mainloop run
  GetEntResolver: Make it possible to resolve uid/gid to name
  utils.algo: Add InvertDict to invert a dict
  autotools: Add noded group

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>