Support tofino build for P4_14 test programs

Also, modified programs such that both the P4_14 and P4_16 versions
produce the same forwarding behaviour and control API (i.e. P4Info)

Change-Id: I90b7fdfedff5f2a89e0f2295d32e2bb61cd0e0eb
diff --git a/tools/test/p4src/p4-16/p4c-out/default.p4info b/tools/test/p4src/p4-16/p4c-out/default.p4info
index 957149e..a485e17 100644
--- a/tools/test/p4src/p4-16/p4c-out/default.p4info
+++ b/tools/test/p4src/p4-16/p4c-out/default.p4info
@@ -38,7 +38,7 @@
     id: 16824896
   }
   action_refs {
-    id: 16793508
+    id: 16784184
   }
   direct_resource_ids: 301990488
   size: 1024
@@ -87,9 +87,9 @@
 }
 actions {
   preamble {
-    id: 16793508
-    name: "drop"
-    alias: "drop"
+    id: 16784184
+    name: "_drop"
+    alias: "_drop"
   }
 }
 actions {