dirmngr: Drop useless housekeeping.

dirmngr: Drop useless housekeeping.

* dirmngr/dirmngr.c (handle_tick, time_for_housekeeping_p,
housekeeping_thread): Remove, no longer needed.
(handle_connections): Drop any attempt at a timeout, since no
housekeeping is necessary.

--

The housekeeping thread no longer does anything, and the main loop was
waking up every 60 seconds for no good reason.  The code is simpler
and the runtime is more efficient if we drop this.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Gbp-Pq: Topic dirmngr-idling
Gbp-Pq: Name 0005-dirmngr-Drop-useless-housekeeping.patch