IB: EndOfStreamException should cause adapter to disconnect

```
System.IO.EndOfStreamException: Unable to read beyond the end of the stream.
   at System.IO.__Error.EndOfFile()
   at System.IO.BinaryReader.ReadByte()
   at IBApi.EReader.ReadString()
   at IBApi.EReader.ReadInt()
   at IBApi.EReader.ReadAndProcessMessages()
```