LineWriter fix #2131
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- translate `std::io::LineWriter`'s unit test - rename `inner` field to `buf_writer` to avoid confusion with `BufWriter::inner` - the above lead me to re-write the logic accordingly - add methods to access `buf_writer`'s fields - sorting out types, cannot compile for now
- default `poll_write_vectored` behaves differently of `std::io::LineWriter::write_vectored` - ported from https://github.com/rust-lang/rust/blob/673d0db5e393e9c64897005b470bfeb6d5aec61b/library/std/src/io/buffered/tests.rs - that code has lots of comments, you may wanna check it out - translated tests for `std` 's `line_vectored` - added `inner_poll_write_vectored` to keep code explicit and verbose
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