Having bootstrap.servers configured in ~/.config/kcat.conf causes errors output with mock cluster

[jcaesar]

File: ~/.config/kcat.conf

bootstrap.servers=localhost

Error output:

% Mock cluster started with bootstrap.servers=127.0.0.1:34481
% Press Ctrl-C+Enter or Ctrl-D to terminate.
%3|1678154818.783|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT)BROKERS=127.0.0.1:34481

%3|1678154819.783|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT, 1 identical error(s) suppressed)
%3|1678154849.784|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT, 30 identical error(s) suppressed)
%3|1678154879.785|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT, 30 identical error(s) suppressed)
%3|1678154909.786|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT, 30 identical error(s) suppressed)

I'm not sure this causes any actual problems, I wouldn't mind this being closed as "who cares".