Potentially resolve issue with os signals (#144)

* change error format

* capture SIGTERM for upstart, ignore SIGKILL

* for windows only notify on SIGINT

service_upstart_linux.go

@@ -11,6 +11,7 @@ import (
 	"os/signal"
 	"regexp"
 	"strings"
+	"syscall"
 	"text/template"
 	"time"
 )
@@ -186,7 +187,7 @@ func (s *upstart) Run() (err error) {
 
 	s.Option.funcSingle(optionRunWait, func() {
 		var sigChan = make(chan os.Signal, 3)
-		signal.Notify(sigChan, os.Interrupt, os.Kill)
+		signal.Notify(sigChan, syscall.SIGTERM, os.Interrupt)
 		<-sigChan
 	})()
 

service_windows.go

@@ -268,7 +268,7 @@ func (ws *windowsService) Run() error {
 
 	sigChan := make(chan os.Signal)
 
-	signal.Notify(sigChan, os.Interrupt, os.Kill)
+	signal.Notify(sigChan, os.Interrupt)
 
 	<-sigChan
 
@@ -311,7 +311,7 @@ func (ws *windowsService) Status() (Status, error) {
 	case svc.Stopped:
 		return StatusStopped, nil
 	default:
-		return StatusUnknown, fmt.Errorf("unknown status %s", status)
+		return StatusUnknown, fmt.Errorf("unknown status %v", status)
 	}
 }