GUACAMOLE-281: Merge docker sanity check fix.
GUACAMOLE-281: Merge docker sanity check fix.

esmailpour-hosein/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,lato333/guacamole-client,glyptodon/guacamole-client,jmuehlner/incubator-guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,necouchman/incubator-guacamole-client,necouchman/incubator-guacamole-client,glyptodon/guacamole-client,softpymesJeffer/incubator-guacamole-client,lato333/guacamole-client,lato333/guacamole-client,mike-jumper/incubator-guacamole-client,softpymesJeffer/incubator-guacamole-client,lato333/guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,softpymesJeffer/incubator-guacamole-client,necouchman/incubator-guacamole-client,softpymesJeffer/incubator-guacamole-client,necouchman/incubator-guacamole-client