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A recent change to the vishvananda/netlink package exposes NLM_F_DUMP_INTR in some netlink responses as an EINTR (with no data). Retry the requests when that happens, up to five times, before returning the error. The limit of five is arbitrary, on most systems a single retry will be rare but, there's no guarantee that a retry will succeed. So, on a very busy or misbehaving system the error may still be returned. In most cases, this will lead to failure of the operation being attempted (which may lead to daemon startup failure, network initialisation failure etc). Signed-off-by: Rob Murray <rob.murray@docker.com>