Added a group, to unsure home assistant pack them in a single device

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/0.7@2967 b32b6428-25c9-4566-ad07-03861ab6144f

devices/sensors/HTU21D/xaal/htu21d/devs.py

@@ -54,11 +54,15 @@ class GW:
         rate = float(cfg['refresh'])
         self.engine.add_timer(self.process,rate)
 
+        grp_uuid = tools.get_random_uuid()
+
         dev = build_dev(tools.get_uuid(cfg['thermometer']) ,"thermometer.basic")
+        dev.group_id = grp_uuid     
         self.temp = dev.new_attribute("temperature")
         self.engine.add_device(dev)
         
         dev = build_dev(tools.get_uuid(cfg['hygrometer']),"hygrometer.basic")
+        dev.group_id = grp_uuid
         self.hum = dev.new_attribute("humidity")
         self.engine.add_device(dev)