go/fixchain: increase latitude to 5% to deflake test (#1336)
go/fixchain: increase latitude to 5% to deflake test (#1336)

Seen a Travis run with "Expected ~1000, got 1045" so increase
the latitude from (limit + 0.5%) + 1 to (limit + 5%) + 1.
RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,google/certificate-transparency-go,daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,google/certificate-transparency-go,RJPercival/certificate-transparency-go,google/certificate-transparency-go