[pkg-go] Bug#832834: golang-github-boltdb-bolt: FTBFS: Tests failures

[Shengjing Zhu]

I meet this FTBFS either.
After looking at the code, I think it's caused by this test only waits
5s for writing 134M data.
So I changed the time to 180s which I think sufficient for most disks.
https://anonscm.debian.org/cgit/pkg-go/packages/golang-github-boltdb-bolt.git/commit/?id=e989709

Since the upstream is not active now, I haven't reported it to upstream.

Thanks
Shengjing Zhu