[Lambda] Fix logging to only happen inside lambda function

aws_xray_sdk/core/lambda_launcher.py

@@ -72,7 +72,7 @@ def put_subsegment(self, subsegment):
         current_entity = self.get_trace_entity()
 
         if not self._is_subsegment(current_entity) and (getattr(current_entity, 'initializing', None) or isinstance(current_entity, DummySegment)):
-            if global_sdk_config.sdk_enabled():
+            if global_sdk_config.sdk_enabled() and not os.getenv(LAMBDA_TRACE_HEADER_KEY):
                 log.warning("Subsegment %s discarded due to Lambda worker still initializing" % subsegment.name)
             return