Encapsulate Socket.InputStream on Session

[Valentin]

Incapsulate Session.getRawInput(), so returned stream couldn't be closed outside.
This solve few problems:

1. Possible to use InputStream in try block in DataInputStream etc...
2. All Decorators (BdatInputStream, DotTerminatedInputStream etc...) of InputStream also could be closed, prevent stream leaks inside decorators

Example of code that will be fixed

private static byte[] readAndClose(InputStream is, int maxMessageSize)
                throws IOException, TooMuchDataException {
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            byte[] buffer = new byte[8192];
            int n;
            try {
                while ((n = is.read(buffer)) != -1) {
                    bytes.write(buffer, 0, n);
                    if (maxMessageSize > 0 && bytes.size() > maxMessageSize) {
                        throw new TooMuchDataException("message size exceeded maximum of " + maxMessageSize + "bytes");
                    }
                }
            } finally {
                // TODO creator of stream should close it, not this method
                is.close();
            }
            return bytes.toByteArray();
        }

[Valentin]

@davidmoten Hello, any update?

[Dave Moten]

I'll answer on ytour related PR #113.