C-tagging for DHCP message

Change-Id: I378b1cb9283767d0b01c3d30b359436fa66ccdf5
diff --git a/core/io_info.go b/core/io_info.go
index 4252509..c913192 100644
--- a/core/io_info.go
+++ b/core/io_info.go
@@ -17,8 +17,8 @@
 package core
 
 import (
-	"errors"
 	"github.com/google/gopacket/pcap"
+	"errors"
 	"log"
 )