TBR: veyron/lib/modules: Fix test

The test failed with:
modules_test.go:247: failed to find "LESSCLOSE=/usr/bin/lesspipe %!s(MISSING) %!s(MISSING)" in [...]

Change-Id: I1a7edd894e2b0f6b8d600dad5f83cc529a06a8c8
diff --git a/lib/modules/modules_test.go b/lib/modules/modules_test.go
index 3c96b07..6869816 100644
--- a/lib/modules/modules_test.go
+++ b/lib/modules/modules_test.go
@@ -49,7 +49,7 @@
 		fmt.Fprintf(stdout, "%s%s\n", printEnvArgPrefix, a)
 	}
 	for k, v := range env {
-		fmt.Fprintf(stdout, k+"="+v+"\n")
+		fmt.Fprintln(stdout, k+"="+v)
 	}
 	return nil
 }