GUACAMOLE-928: Merge keep FreeRDP plugins of Docker image within /usr/local/guacamole
GUACAMOLE-928: Merge keep FreeRDP plugins of Docker image within /usr/local/guacamole


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