[MERGE] hpss startup/shutdown hooks

[Robert Collins]

This little patch fixes the hpss to cleanup its listening socket better,
which I noted while doing the main thing in it: adding hooks to allow
code (in this case the dbus plugin) to note when the server starts and
finishes.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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