snowflake changes from global static variables to one instance per thread

test/debug_plugin/debug_plugin.cpp

@@ -1,19 +1,12 @@
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
 #include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
 #include <stdarg.h>
-#include <time.h>
 #include <pthread.h>
-#include <arpa/inet.h>
 
 #include "utils.h"
 #include "packet_dump.h"
 #include "session_private.h"
-#include "stellar/session.h"
-#include "stellar/packet.h"
 #include "stellar/stellar_mq.h"
 #include "stellar/stellar_exdata.h"