Mark some missing Network tests as net_tests. (#465)

Author: waahm7

tests/CMakeLists.txt

@@ -500,13 +500,13 @@ add_test_case(h2_client_manual_data_write_connection_close)
 add_test_case(server_new_destroy)
 add_test_case(server_new_destroy_tcp)
 add_test_case(connection_setup_shutdown)
-add_test_case(connection_setup_shutdown_tls)
+add_net_test_case(connection_setup_shutdown_tls)
 add_test_case(connection_setup_shutdown_proxy_setting_on_ev_not_found)
 add_test_case(connection_setup_shutdown_pinned_event_loop)
 add_test_case(connection_h2_prior_knowledge)
 add_test_case(connection_h2_prior_knowledge_not_work_with_tls)
-add_test_case(connection_customized_alpn)
-add_test_case(connection_customized_alpn_error_with_unknown_return_string)
+add_net_test_case(connection_customized_alpn)
+add_net_test_case(connection_customized_alpn_error_with_unknown_return_string)
 
 # These server tests occasionally fail. Resurrect if/when we get back to work on HTTP server.
 # add_test_case(connection_destroy_server_with_connection_existing)