GUACAMOLE-1174: Create function for appending endpoint params, fix endpoint params overwriting.
GUACAMOLE-1174: Create function for appending endpoint params, fix endpoint params overwriting.

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