Move all status output to stdout

I've noticed a few instances of interleaved status messages in between
lines in a terminal/Writer.Print call on our build servers. Since
there's a lock protecting everything we write, I've got to assume this
is a stdout vs stderr problem. Ninja had always been outputing to
stdout, except for error messages, which are now marked with FAILED:
like failed actions.

Test: m blueprint_tools
Test: m missing
Change-Id: Idf8320d40694abf212c902c63a9703e4440ffb7a
diff --git a/ui/terminal/status.go b/ui/terminal/status.go
index 5719456..c8eb382 100644
--- a/ui/terminal/status.go
+++ b/ui/terminal/status.go
@@ -45,7 +45,9 @@
 }
 
 func (s *statusOutput) Message(level status.MsgLevel, message string) {
-	if level > status.StatusLvl {
+	if level >= status.ErrorLvl {
+		s.writer.Print(fmt.Sprintf("FAILED: %s", message))
+	} else if level > status.StatusLvl {
 		s.writer.Print(fmt.Sprintf("%s%s", level.Prefix(), message))
 	} else if level == status.StatusLvl {
 		s.writer.StatusLine(message)