Fix to bug #678, http://bugs.skysql.com/show_bug.cgi?id=678

tee.c:routeQuery cloned partial MySQL packets to be routed to child router. Problems were due to the use of gwbuf_clone and modutil_MySQL_query which clone/examine only the first buffer from the buffer list which composes GWBUF.
modutil.c: Added function modutil_MySQL_query_len which calculates MySQL packet length and the missing bytecount

server/core/buffer.c

@@ -201,6 +201,36 @@ GWBUF	*rval;
 	return rval;
 }
 
+/**
+ * Clone whole GWBUF list instead of single buffer.
+ * 
+ * @param buf	head of the list to be cloned till the tail of it
+ * 
+ * @return head of the cloned list or NULL if the list was empty.
+ */
+GWBUF* gwbuf_clone_all(
+	GWBUF* buf)
+{
+	GWBUF* rval;
+	GWBUF* clonebuf;
+	
+	if (buf == NULL)
+	{
+		return NULL;
+	}
+	/** Store the head of the list to rval. */
+	clonebuf = gwbuf_clone(buf);
+	rval = clonebuf;
+	
+	while (buf->next)
+	{
+		buf = buf->next;
+		clonebuf->next = gwbuf_clone(buf);
+		clonebuf = clonebuf->next;
+	}
+	return rval;
+}
+
 
 GWBUF *gwbuf_clone_portion(
         GWBUF *buf,