[Tor-BSD] new tor -alpha release and DOS attacks

[George Rosamond]

For anyone who's running any directory services, there has been heavy
memory-consuming attacks going on since last week.

We should discuss mitigation on the operating system level with
host-based firewalling and syctl knobs in a separate thread, but the new
tor -alpha release is supposed to deal with the issue.

The FreeBSD security/tor-devel was updated zippy quick, and I'm running
it now on NYCBUG0.

g
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