[pkg-go] Bug#831789: etcd FTBFS on arm64, testsuit failures

[Peter Green]

package: etcd
version: 2.3.7+dfsg-3
severity: serious

 From the build log: 
https://buildd.debian.org/status/fetch.php?pkg=etcd&arch=arm64&ver=2.3.7%2Bdfsg-3&stamp=1468514503

> === RUN   TestTransportErrorc
> --- FAIL: TestTransportErrorc (0.15s)
> 	transport_test.go:153: cannot receive error from errorc

> === RUN   TestCheckVersionCompatibility
> --- PASS: TestCheckVersionCompatibility (0.00s)
> FAIL
> FAIL	github.com/coreos/etcd/rafthttp	2.106s