When 'go tool dist test' stops, it was intended that it first wait for
pending background tests, like a failed compilation waits for pending
background compiles. But these three lines prevented that.
Fix by deleting them. (The actual loop already contains the correct
logic to avoid running the others and to wait for what's left.)

Change-Id: I4e945495ada903fb0af567910626241bc1c52ba6
Reviewed-on: https://go-review.googlesource.com/18232Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>