message: test: add two edge case tests for CSubNet
diff: @@ -160,6 +160,9 @@ BOOST_AUTO_TEST_CASE(subnet_test)
  BOOST_CHECK(ResolveSubNet("1.2.2.20/26").Match(ResolveIP("1.2.2.63")));
  // All-Matching IPv6 Matches arbitrary IPv4 and IPv6
  BOOST_CHECK(ResolveSubNet("::/0").Match(ResolveIP("1:2:3:4:5:6:7:1234")));
  + // But not `::` or `0.0.0.0` because they are considered invalid addresses
  + BOOST_CHECK(!ResolveSubNet("::/0").Match(ResolveIP("::")));
  + BOOST_CHECK(!ResolveSubNet("::/0").Match(ResolveIP("0.0.0.0")));
  BOOST_CHECK(ResolveSubNet("::/0").Match(ResolveIP("1.2.3.4")));
  // All-Matching IPv4 does not Match IPv6
  BOOST_CHECK(!ResolveSubNet("0.0.0.0/0").Match(ResolveIP("1:2:3:4:5:6:7:1234")));
  