Change simple_switch_grpc priority zero test

As per the P4Runtime spec, zero is not a valid priority any more for
ternary matches.

targets/simple_switch_grpc/tests/test_ternary.cpp

@@ -173,24 +173,14 @@ TEST_F(SimpleSwitchGrpcTest_Ternary, PriorityOrder) {
   }
 }
 
-// zero is the lowest priority in P4Runtime (which corresponds to a high
-// priority value in bmv2); this test was added for the following issue:
-// https://github.com/p4lang/behavioral-model/issues/618
+// zero is not a valid priority value in P4Runtime
 TEST_F(SimpleSwitchGrpcTest_Ternary, PriorityZero) {
   int priority = 0;
-  int ig_port = 3;
   std::string pkt("\xaa\xbb");
   p4::bm::PacketStreamResponse rcv_pkt;
   auto entity = make_entry("\xaa\xbb", "\xff\xff", priority, a_s1_id);
-  {
-    auto status = add_entry(entity);
-    EXPECT_TRUE(status.ok());
-  }
-  {
-    auto status = send_and_receive(pkt, ig_port, &rcv_pkt);
-    EXPECT_TRUE(status.ok());
-    EXPECT_EQ(1, rcv_pkt.port());
-  }
+  auto status = add_entry(entity);
+  EXPECT_FALSE(status.ok());
 }
 
 }  // namespace