GUACAMOLE-470: Reset character attributes on terminal reset.
GUACAMOLE-470: Reset character attributes on terminal reset.

The character attributes such as foreground/background colors should be
reset as well when performing a terminal reset.

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