Update bf-p4c output with most recent fabric.p4 changes from onos-2.2

Also, adds a changelog file to keep track of the fabric.p4 changes
included at a given point in time.

Change-Id: Ia6933ddb392ff5c93d7822a3fd962f609224eba1
diff --git a/src/main/resources/p4c-out/fabric-spgw/tofino/montara_sde_9_0_0/p4info.txt b/src/main/resources/p4c-out/fabric-spgw/tofino/montara_sde_9_0_0/p4info.txt
index 56a16cd..5bbc2c3 100644
--- a/src/main/resources/p4c-out/fabric-spgw/tofino/montara_sde_9_0_0/p4info.txt
+++ b/src/main/resources/p4c-out/fabric-spgw/tofino/montara_sde_9_0_0/p4info.txt
@@ -229,13 +229,13 @@
   }
   match_fields {
     id: 5
-    name: "eth_src"
+    name: "eth_dst"
     bitwidth: 48
     match_type: TERNARY
   }
   match_fields {
     id: 6
-    name: "eth_dst"
+    name: "eth_src"
     bitwidth: 48
     match_type: TERNARY
   }