A network error may cause failure. Retry it 5 times like we already do with curl and its retry argument. Instead of adding another cache layer only to make it reliable, it seems fitting to make the existing cache layer reliable. Change-Id: Ic319c5b8997741b99f3343cc856a8f012c9a0de7 Signed-off-by: Michal Nasiadka <mnasiadka@gmail.com>