gotest: generate correct gofmt-formatted _testmain.go Fixes issue 1225.
gotest: generate correct gofmt-formatted _testmain.go
Fixes issue 1225.

R=adg
CC=golang-dev
http://codereview.appspot.com/2729041
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go