check if it is io.EOF from grpc.rpcError
check if it is io.EOF from grpc.rpcError

Signed-off-by: Lai Jiangshan <b337eedf453972390e4695e362aeea2634ef4e0c@gmail.com>

gnawux/runv,gao-feng/runv,jinfenw/runv,laijs/runv,laijs/runv,gao-feng/runv,laijs/runv,hyperhq/runv,gnawux/runv,bergwolf/runv,gnawux/runv,bergwolf/runv,hyperhq/runv,jinfenw/runv,bergwolf/runv,jinfenw/runv,hyperhq/runv,gao-feng/runv