Update libssh to ssh_handle_packets_termination

cherry-picked from 0cb5248

Should resolve all timeout problems

Conflicts:

	src/auth.c
	src/channels.c

include/libssh/channels.h

@@ -94,6 +94,7 @@ SSH_PACKET_CALLBACK(channel_rcv_data);
 ssh_channel ssh_channel_new(ssh_session session);
 int channel_default_bufferize(ssh_channel channel, void *data, int len,
         int is_stderr);
+int ssh_channel_flush(ssh_channel channel);
 uint32_t ssh_channel_new_id(ssh_session session);
 ssh_channel ssh_channel_from_local(ssh_session session, uint32_t id);
 int channel_write_common(ssh_channel channel, const void *data,

include/libssh/session.h

@@ -62,6 +62,11 @@ enum ssh_pending_call_e {
 /* libssh calls may block an undefined amount of time */
 #define SSH_SESSION_FLAG_BLOCKING 1
 
+/* codes to use with ssh_handle_packets*() */
+#define SSH_TIMEOUT_INFINITE -1
+#define SSH_TIMEOUT_USER -2
+#define SSH_TIMEOUT_NONBLOCKING 0
+
 /* members that are common to ssh_session and ssh_bind */
 struct ssh_common_struct {
     struct error_struct error;