net: use V2Transport when NODE_P2P_V2 service flag is present

Co-authored-by: Dhruv Mehta <856960+dhruv@users.noreply.github.com>

test/functional/p2p_v2_transport.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+# Copyright (c) 2021-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""
+Test v2 transport
+"""
+
+from test_framework.messages import NODE_P2P_V2
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
+
+class V2TransportTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain=True
+        self.num_nodes = 1
+        self.extra_args = [["-v2transport=0"]]
+
+    def run_test(self):
+        network_info = self.nodes[0].getnetworkinfo()
+        assert_equal(int(network_info["localservices"], 16) & NODE_P2P_V2, 0)
+        assert "P2P_V2" not in network_info["localservicesnames"]
+
+        self.restart_node(0, ["-v2transport=1"])
+        network_info = self.nodes[0].getnetworkinfo()
+        assert_equal(int(network_info["localservices"], 16) & NODE_P2P_V2, NODE_P2P_V2)
+        assert "P2P_V2" in network_info["localservicesnames"]
+
+if __name__ == '__main__':
+    V2TransportTest().main()