vinyl: refactor vy_run_write
vinyl: refactor vy_run_write

Split it into two functions writing data and meta. Get rid of some
useless arguments. Needed by the next patch.

mejedi/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,mejedi/tarantool,rtsisyk/tarantool,mejedi/tarantool,mejedi/tarantool,rtsisyk/tarantool