Refactored INT service impl to support multi-instance ONOS and fabric.p4

Change-Id: Ic82a3ab72d71a774606b25997e283b93aedc6ec9
diff --git a/pipelines/fabric/src/main/resources/include/int/int_header.p4 b/pipelines/fabric/src/main/resources/include/int/int_header.p4
index f339995..4e352ee 100644
--- a/pipelines/fabric/src/main/resources/include/int/int_header.p4
+++ b/pipelines/fabric/src/main/resources/include/int/int_header.p4
@@ -26,6 +26,8 @@
     bit<32> switch_id;
     bit<8>  new_words;
     bit<16> new_bytes;
+    bit<32> ig_tstamp;
+    bit<32> eg_tstamp;
 }
 
 // INT headers - 8 bytes