vinyl: move vy_planner_peek_XXX and vy_task code to schedule
vinyl: move vy_planner_peek_XXX and vy_task code to schedule

Re-order code and rename functions, no semantic changes.

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