Make the load generator's devices real link senders, many on one thread

links.c was a second implementation of the packet format; each device is
now a PureLinkSender on a socket of its own, keyed with a secret made
outside (pure_link_sender_shared: a key kept elsewhere, or a test's
many). M1 (1k, 10k) and M2 (10k, kill -9) pass with it: no silent step,
caught up in 0.2 s, every order applied once; the slowest store after
the restart is now the sender's 1 s wait for a word of the save
(STORED_WAIT), where the old devices tried again after 200 ms.

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