GUACAMOLE-987: Set ldap-user-attributes via env variable
GUACAMOLE-987: Set ldap-user-attributes via env variable

Set the ldap-user-attributes if the corresponding LDAP_USER_ATTRIBUTES is set.

mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client