lshd_connection_service to make_lshd_connection_service.
(make_lshd_listen): Use kexinit_filter to restrict announced
hostkey algorithms to those that we actually have keys for.
(make_lshd_listen): Use listen_callback, in order to get the right
evaluation order.

* src/lsh-writekey.c (make_lsh_writekey_options): Use
all_symmetric_algorithms() and all_symmetric_algorithms().
* src/lsh.c (make_options): Likewise.
* src/lsh_proxy.c (main): Likewise.
* src/lshd.c (make_lshd_options): Likewise.

Rev: src/lshd.c:1.96