Commits on Jul 29, 2022

1. consensus: fix expected condition variable exception …

   The Seastar docs[1] say wait() returns condition_variable_timed_out, not
   timed_out_error. This resulted in error logs like:
   
   ```
   INFO  2022-07-29 00:03:16,777 [shard 0] raft - [group_id:5, {kafka/topic-fhmhqjvhxd/4}] consensus.cc:2757 - Starting leadership transfer from {id: {5}, revision: {32}} to {id: {4}, revision: {32}} in term 1
   INFO  2022-07-29 00:03:16,777 [shard 0] raft - [group_id:5, {kafka/topic-fhmhqjvhxd/4}] consensus.cc:2660 - transfer leadership: waiting for node {id: {4}, revision: {32}} to catch up
   ...
   ERROR 2022-07-29 00:03:26,777 [shard 0] rpc - Service handler threw an exception: seastar::condition_variable_timed_out (Condition variable timed out)
   // ... no corresponding message about the end of the leadership transfer
   ```
   
   [1] https://docs.seastar.io/master/classseastar_1_1condition__variable.html#a69703300a8e56a520269062f062aebda

   

   andrwng committed Jul 29, 2022
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