Merge #1999

1999: inotify: Add AsFd to allow using with epoll (issue #1998) r=asomers a=VorpalBlade

This resolves issue #1998 and allows `Inotify` to be used by `Epoll` by adding AsFd.

I'm not entirely sure about the unit test. Maybe it would be possible to do a more comperhensive check by contructing inotify using `from_raw_fd` and checking that I get the same value back. However, that would basically mean duplicating  `Inotify::new` and that feels a bit pointless.

Another option would be to create an integration test to combine `Inotify` and `Epoll`.

Fixes #1998

Co-authored-by: Arvid Norlander <VorpalBlade@users.noreply.github.com>

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