[Dovecot] BSD people, please test kqueue changes

[Timo Sirainen]

I rewrote much of the kqueue code since the old code didn't handle
properly the case when both input and output I/O handlers were added to
the same file descriptor with different callbacks. This is done commonly
in Dovecot, so I'm wondering why more people didn't complain about
problems with it.. :)

I don't anyway have access to any BSDs so the code is completely
untested. Please test how it works before 1.0rc7 :)

http://dovecot.org/nightly/dovecot-latest.tar.gz

I'd guess the hangs caused by recent RC versions were because the
default was to use notify=kqueue instead of notify=none. I changed this
back to none unless --with-ioloop=kqueue is used.

There are a couple of things in the code that I'm not completely sure
of. The kqueue() manual page says that EV_ADD "modifies" the event if it
already exists. What exactly does that mean? Does it mean that the
filter is replaced, or that it's ORed into the existing one? The same
question for the EV_DELETE, does it delete everything or only those
filters given in parameters?

The code currently assumes ORing and EV_DELETE deleting only the given
filters, since this is what the original code also did.

I suppose the data and udata parameters don't matter in EV_DELETE since
they weren't given originally in ioloop-notify-kqueue.c either, so I
left them that way.
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