download_manifest: fix call on deleted function

Change-Id: Ib862fea9481aefd7b91fd0cd63b7c2c10ecdd34d
Signed-off-by: Stephane Desneux <stephane.desneux@open.eurogiciel.org>
check if manifest file was downloaded correctly

Change-Id: Ide7f5a79b45c7b880e5615b7ba0c277a4d092389
Signed-off-by: Stephane Desneux <stephane.desneux@open.eurogiciel.org>