Revert "ENYO-1740: remove archive mistake"

This reverts commit 4d12c9c4ff6f5e2e52ea7608b9b5fb20d9b300ad.
ENYO-1740: put back some of the archival mistake content (structure)

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-1740: Add JSON schema of Dropbox Authentication object

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-1740: Improve fsXXX test suite (add relative root)

- Test now run from a subfolder `_test` of the remote storage.  This is
  required by fsDropbox, as Ares does not master the file-system root
  node of fsDropbox (unlike fsLocal).

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-1740: Pass Dropbox status code & error message to Ares client

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>