move to untimestamped logs, tag the lots INFO and DEBUG. Update tests

main.go

@@ -5,10 +5,14 @@ package main
 import (
 	"flag"
 	"log"
+	"os"
+	"os/signal"
+	"syscall"
 
 	"govpp-snmp-agentx/agentx"
 	"govpp-snmp-agentx/config"
 	"govpp-snmp-agentx/ifmib"
+	"govpp-snmp-agentx/logger"
 	"govpp-snmp-agentx/vppstats"
 )
 
@@ -38,6 +42,14 @@ func main() {
 	// Start VPP stats routine with callback to update MIB
 	vppstats.StartStatsRoutine(interfaceMIB.UpdateStats)
 
-	// Keep the main routine running
-	select {}
+	// Set up signal handling for graceful shutdown
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	// Wait for shutdown signal
+	<-sigChan
+	logger.Printf("Shutting down...")
+	
+	// Flush any buffered log entries
+	logger.Sync()
 }