[NRRPLT-0000][HOTFIX] Fix kuka_lbr_iiwa_generic_d6 config file.

- Use correct robot xml schema: robot_model_configuration
- Version tag must be a decimal number.

kuka_lbr_iiwa_generic_d6/model.config

-<?xml version="1.0" ?>
-<model xmlns="http://schemas.humanbrainproject.eu/SP10/2017/environment_model_config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://schemas.humanbrainproject.eu/SP10/2017/environment_model_config ../environment_model_configuration.xsd">
+<?xml version='1.0'?>
+<model xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.humanbrainproject.eu/SP10/2017/robot_model_config" xsi:schemaLocation="http://schemas.humanbrainproject.eu/SP10/2017/robot_model_config ../robot_model_configuration.xsd">
 	<name>KUKA LBR IIWA 820 Generic d6</name>
-	<version>1.2.0</version>
-        <maturity>production</maturity>
+	<version>1.2</version>
+    <maturity>production</maturity>
 	<thumbnail>thumbnail.png</thumbnail>
 	<sdf version="1.5">model.sdf</sdf>
 	<license>Apache 2.0</license>
@@ -15,5 +15,5 @@
 		<email>feldotto@in.tum.de</email>
 	</author>
 	<description>Model of a KUKA LBR IIWA 820 robot.</description>
-        <website>http://wiki.ros.org/kuka_lbr_iiwa_support</website>
+    <website>http://wiki.ros.org/kuka_lbr_iiwa_support</website>
 </model>