Correctly respect timeouts in consumer poll interface (#1384)

Author: braedon

kafka/consumer/group.py

@@ -642,7 +642,7 @@ def _poll_once(self, timeout_ms, max_records):
         # Send any new fetches (won't resend pending fetches)
         self._fetcher.send_fetches()
 
-        timeout_ms = min(timeout_ms, self._coordinator.time_to_next_poll())
+        timeout_ms = min(timeout_ms, self._coordinator.time_to_next_poll() * 1000)
         self._client.poll(timeout_ms=timeout_ms)
         # after the long poll, we should check whether the group needs to rebalance
         # prior to returning data so that the group can stabilize faster