added option to disable trivial auth methods (#128)

* added option to disable trivial auth methods

* rename argument to match with other ssh clients

* fixed trivial auth detection for pubkeys

cli-authinteract.c

@@ -114,6 +114,7 @@ void recv_msg_userauth_info_request() {
 	m_free(instruction);
 
 	for (i = 0; i < num_prompts; i++) {
+		cli_ses.is_trivial_auth = 0;
 		unsigned int response_len = 0;
 		prompt = buf_getstring(ses.payload, NULL);
 		cleantext(prompt);