Move all output through StatusOutput

Write log output through StatusOutput so that the status implementation
can synchronize it with its own output.

Test: status_test.go
Change-Id: I917bdeeea4759a12b6b4aa6d6d86ee18a2771723

ui/status/log.go

@@ -71,6 +71,11 @@ func (v *verboseLog) Message(level MsgLevel, message string) {
 	fmt.Fprintf(v.w, "%s%s\n", level.Prefix(), message)
 }
 
+func (v *verboseLog) Write(p []byte) (int, error) {
+	fmt.Fprint(v.w, string(p))
+	return len(p), nil
+}
+
 type errorLog struct {
 	w io.WriteCloser
 
@@ -134,3 +139,8 @@ func (e *errorLog) Message(level MsgLevel, message string) {
 
 	fmt.Fprintf(e.w, "error: %s\n", message)
 }
+
+func (e *errorLog) Write(p []byte) (int, error) {
+	fmt.Fprint(e.w, string(p))
+	return len(p), nil
+}