secure/bidirule: Use testtext testing harness

Change-Id: I8e9fec1fc51d38a1950f95be63e07fb80d9949e6
Reviewed-on: https://go-review.googlesource.com/30712
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
3 files changed