[PATCH] ctdb-daemon: Fork lock helper with vfork_with_logging()

[Martin Schwenke]

Otherwise errors printed by the lock helper get lost.

* lock_helper_args() no longer adds the program name to the list of
  arguments, since vfork_with_logging() does that.

* Update the lock helper to handle the extra log_fd parameter and send
  stdout/stderr there.

* For simplicity, add an argc parameter to lock_helper_args().  To
  make this sane, also add an argv parameter and change the return
  type to bool.

Please review and push if OK.

peace & happiness,
martin
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