close TachyonFS when closing AbstractTFS
Merge pull request #578 from shimingfei/CloseTachyonFS

close TachyonFS when closing AbstractTFS
remove unused FileDoesNotException for getFileStatus - thrift change
remove unused FileDoesNotException for getFileStatus - non-thrift change
Merge pull request #580 from shimingfei/RemoveExceptionForGetFileStatus

Remove exception for get file status
simplify get HdfsInputStream logic in HdfsFileInputStream