update config, add default.json

authhook/config/default.json

+{
+    "device_registry_host"     : "127.0.0.1",
+    "device_registry_port"     : 8990,
+
+    "device_shadow_host"       : "127.0.0.1",
+    "device_shadow_port"       : 8991,
+
+    "auth_on_register_debug"   : true,
+    "auth_on_publish_debug"    : true,
+    "auth_on_subscribe_debug"  : true,
+    "on_publish_debug"         : true,
+    "on_deliver_debug"         : true,
+    "on_unsubscribe_debug"     : true
+}