eth/downloader: fix #992, where tests may time out on a slow machine
eth/downloader: fix #992, where tests may time out on a slow machine

maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum