Implement FSDISTransport in Compatible layer.
Fix bugs in Binary.
Make BytePacker consume ByteBuffer directly.
disable enforcer to pass build.
remove some unncessary codes.
add compatible method initFromPage in ValueReaders.
add toByteBuffer method in ByteBufferInputStream.
add V21FileAPI class to encapsulate v21 APIs and make it a singlton.
add ByteBuffer based equal and compareto method in Binary.