p2p: remove BIP155Network::TORV2 from GetBIP155Network()

src/netaddress.cpp

@@ -32,14 +32,7 @@ CNetAddr::BIP155Network CNetAddr::GetBIP155Network() const
     case NET_IPV6:
         return BIP155Network::IPV6;
     case NET_ONION:
-        switch (m_addr.size()) {
-        case ADDR_TORV2_SIZE:
-            return BIP155Network::TORV2;
-        case ADDR_TORV3_SIZE:
-            return BIP155Network::TORV3;
-        default:
-            assert(false);
-        }
+        return BIP155Network::TORV3;
     case NET_I2P:
         return BIP155Network::I2P;
     case NET_CJDNS:

src/netaddress.h

@@ -302,7 +302,7 @@ class CNetAddr
         /**
          * Get the BIP155 network id of this address.
          * Must not be called for IsInternal() objects.
-         * @returns BIP155 network id
+         * @returns BIP155 network id, except TORV2 which is no longer supported.
          */
         BIP155Network GetBIP155Network() const;