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

wesolows/golang,wesolows/golang,wesolows/golang,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old