Fix issues found by staticcheck

cmd/mtredisalize/main.go

@@ -13,6 +13,7 @@ import (
 	"os/signal"
 	"runtime"
 	"strings"
+	"syscall"
 	"time"
 
 	"bitbucket.org/s_l_teichmann/mtsatellite/common"
@@ -135,7 +136,7 @@ func main() {
 	connChan := make(chan net.Conn)
 	defer close(connChan)
 	sigChan := make(chan os.Signal, 1)
-	signal.Notify(sigChan, os.Interrupt, os.Kill)
+	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
 
 	go func() {
 		for {