Use serialization parameters for CAddress serialization

This also cleans up the addrman (de)serialization code paths to only
allow `Disk` serialization. Some unit tests previously forced a
`Network` serialization, which does not make sense, because Bitcoin Core
in production will always `Disk` serialize.
This cleanup idea was suggested by Pieter Wuille and implemented by Anthony
Towns.

Co-authored-by: Pieter Wuille <pieter@wuille.net>
Co-authored-by: Anthony Towns <aj@erisian.com.au>

src/net.cpp

@@ -202,7 +202,8 @@ static std::vector<CAddress> ConvertSeeds(const std::vector<uint8_t> &vSeedsIn)
     const auto one_week{7 * 24h};
     std::vector<CAddress> vSeedsOut;
     FastRandomContext rng;
-    CDataStream s(vSeedsIn, SER_NETWORK, PROTOCOL_VERSION | ADDRV2_FORMAT);
+    DataStream underlying_stream{vSeedsIn};
+    ParamsStream s{CAddress::V2_NETWORK, underlying_stream};
     while (!s.eof()) {
         CService endpoint;
         s >> endpoint;