Fixup lint errors

  ************* Module agent_streaming.test_infinite_tracing
  tests/agent_streaming/test_infinite_tracing.py:284:8: E1111: Assigning result of a function call, where the function has no return (assignment-from-no-return)
  ************* Module testing_support.util
  tests/testing_support/util.py:39:7: R1714: Consider merging these comparisons with 'in' by using 'hostname in ('localhost', '127.0.0.1')'. Use a set instead if elements are hashable. (consider-using-in)

Author: hmstepanek

tests/agent_streaming/test_infinite_tracing.py

@@ -281,9 +281,8 @@ def condition(*args, **kwargs):
     _create_channel = StreamingRpc.create_channel
 
     def create_channel(self, *args, **kwargs):
-        ret = _create_channel(self, *args, **kwargs)
+        _create_channel(self, *args, **kwargs)
         connect_event.set()
-        return ret
 
     monkeypatch.setattr(StreamingRpc, "condition", condition)
     monkeypatch.setattr(StreamingRpc, "create_channel", create_channel)

tests/testing_support/util.py

@@ -36,7 +36,7 @@ def version2tuple(version_str):
 
 
 def instance_hostname(hostname):
-    if hostname == "localhost" or hostname == "127.0.0.1":
+    if hostname in ["localhost", "127.0.0.1"]:
         hostname = socket.gethostname()
     return hostname