[CRIU] [PATCH 0/5] Unify sync and async page-server read code

[Pavel Emelyanov]

We have page_server_async_read() for async reads from page server and the
receive_remote_pages_info():receive_remote_pages() pair for sync ones.

Also callers of both have to manually manage the io_complete callback.

Let's unify these paths.

-- Pavel