ssh_init
ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0);
ASSERT_INT_EQ(ssh_init(&server, 1, &kex_params), 0);
ASSERT_INT_EQ(ssh_init(&server2, 1, NULL), 0);
int ssh_init(struct ssh **, int is_server, struct kex_params *kex_params);