Updated P4_16 sample programs to reflect HW testbed

Change-Id: I9d76c9bc7632760cd9af1a3a431856291903eaf9
diff --git a/tools/test/p4src/p4-16/include/actions.p4 b/tools/test/p4src/p4-16/include/actions.p4
index c9f2dec..0b87ef3 100644
--- a/tools/test/p4src/p4-16/include/actions.p4
+++ b/tools/test/p4src/p4-16/include/actions.p4
@@ -27,7 +27,7 @@
     standard_metadata.egress_spec = port;
 }
 
-action drop(inout standard_metadata_t standard_metadata) {
+action _drop(inout standard_metadata_t standard_metadata) {
     standard_metadata.egress_spec = DROP_PORT;
 }