Comment 3 for bug 1881967

Also seen in DC lab, apply failed after swacting with the following error:
get_results /usr/local/lib/python3.6/dist-packages/armada/handlers/tiller.py:215^[[00m
2020-06-17 14:15:37.255 16 INFO armada.handlers.lock [-] Releasing lock^[[00m
2020-06-17 14:15:37.259 16 ERROR armada.cli [-] Caught unexpected exception: grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNAVAILABLE
        details = "Name resolution failure"
        debug_error_string = "{"created":"@1592403336.274257011","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2721,"referenced_errors":[{"created":"@1592403336.274254598","description":"Name resolution failure","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":3026,"grpc_status":14}]}"
>
2020-06-17 14:15:37.259 16 ERROR armada.cli Traceback (most recent call last):
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/cli/__init__.py", line 38, in safe_invoke
2020-06-17 14:15:37.259 16 ERROR armada.cli self.invoke()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/cli/apply.py", line 213, in invoke
2020-06-17 14:15:37.259 16 ERROR armada.cli resp = self.handle(documents, tiller)
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/handlers/lock.py", line 81, in func_wrapper
2020-06-17 14:15:37.259 16 ERROR armada.cli return future.result()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/lib/python3.6/concurrent/futures/_base.py", line 425, in result
2020-06-17 14:15:37.259 16 ERROR armada.cli return self.__get_result()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
2020-06-17 14:15:37.259 16 ERROR armada.cli raise self._exception
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
2020-06-17 14:15:37.259 16 ERROR armada.cli result = self.fn(*self.args, **self.kwargs)
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/cli/apply.py", line 256, in handle
2020-06-17 14:15:37.259 16 ERROR armada.cli return armada.sync()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/handlers/armada.py", line 189, in sync
2020-06-17 14:15:37.259 16 ERROR armada.cli known_releases = self.tiller.list_releases()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/handlers/tiller.py", line 252, in list_releases
2020-06-17 14:15:37.259 16 ERROR armada.cli releases = get_results()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/armada/handlers/tiller.py", line 220, in get_results
2020-06-17 14:15:37.259 16 ERROR armada.cli for message in response:
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/grpc/_channel.py", line 364, in __next__
2020-06-17 14:15:37.259 16 ERROR armada.cli return self._next()
2020-06-17 14:15:37.259 16 ERROR armada.cli File "/usr/local/lib/python3.6/dist-packages/grpc/_channel.py", line 358, in _next
2020-06-17 14:15:37.259 16 ERROR armada.cli raise self
2020-06-17 14:15:37.259 16 ERROR armada.cli grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
2020-06-17 14:15:37.259 16 ERROR armada.cli status = StatusCode.UNAVAILABLE
2020-06-17 14:15:37.259 16 ERROR armada.cli details = "Name resolution failure"
2020-06-17 14:15:37.259 16 ERROR armada.cli debug_error_string = "{"created":"@1592403336.274257011","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2721,"referenced_errors":[{"created":"@1592403336.274254598","description":"Name resolution failure","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":3026,"grpc_status":14}]}"
2020-06-17 14:15:37.259 16 ERROR armada.cli >
2020-06-17 14:15:37.259 16 ERROR armada.cli ^[[00m