Change default timeout value

Author: Ibrahim Ethem Gursoy

appsettings.json

@@ -33,7 +33,7 @@
     "EnableCheckPort": true,
     "EnableCheckOnvifMedia": true,
     "EnableCheckRTSPLinks": true,
-    "DiscoveryTimeout": 6000,
+    "DiscoveryTimeout": 60000,
     "ThumbnailsPath": "/tmp/thumbnails/",
     "DefaultDeviceJsonPath": "device_list.json",
     "NetworkInterface": "eth0",