GUACAMOLE-172: Ignore insane timestamps when calculating lag.
GUACAMOLE-172: Ignore insane timestamps when calculating lag.

glyptodon/guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,apache/guacamole-server,apache/guacamole-server