p2p: failure to load p2pstate.bin is not fatal anymore

Clear any partially loaded data, and start with a default config

src/p2p/net_node.inl

@@ -133,9 +133,18 @@ namespace nodetool
     std::ifstream p2p_data;
     p2p_data.open( state_file_path , std::ios_base::binary | std::ios_base::in);
     if(!p2p_data.fail())
+    {
+      try
       {
         boost::archive::binary_iarchive a(p2p_data);
         a >> *this;
+      }
+      catch (const std::exception &e)
+      {
+        LOG_ERROR("Failed to load p2p config file, falling back to default config");
+        m_peerlist = peerlist_manager(); // it was probably half clobbered by the failed load
+        make_default_config();
+      }
     }else
     {
       make_default_config();