(lsh_host_db): Use a NUL-terminated string to identify the host.
(do_lsh_lookup): Likewise.
(make_lsh_host_db): Likewise.
(make_lsh_userauth): Take keys as a parameter. Don't use
options2identities.
(make_lsh_connect): Take options as a parameter, and the remote
address list as argument. Use connect_list.
(main): Call io_resolv_address, read_known_hosts, read_user_keys
and make_lsh_userauth here.

Rev: src/lsh.c:1.180