Add EARLY_WARNING label to EW alerts

gstlal-inspiral/bin/gstlal_ll_inspiral_event_uploader

@@ -497,6 +497,10 @@ class EventUploader(events.EventProcessor):
 		upload a new event + auxiliary files
 		"""
 		# upload event
+		if self.gracedb_search == "EarlyWarning":
+			label = "EARLY_WARNING"
+		else:
+			label = None
 		for attempt in range(1, self.retries + 1):
 			try:
 				resp = self.client.createEvent(
@@ -504,7 +508,8 @@ class EventUploader(events.EventProcessor):
 					self.gracedb_pipeline,
 					'coinc.xml',
 					filecontents = event['favored']['coinc'],
-					search = self.gracedb_search
+					search = self.gracedb_search,
+					labels = label
 				)
 			except HTTPError as resp:
 				logging.warning(resp)