GUAC-1452: Clean up option parsing logic.
GUAC-1452: Clean up option parsing logic.

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