Remove pre-implicit_default_bindings compatibility code #5390
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Implicit default bindings, introduced in RabbitMQ 3.8.x, was a breaking change protected behind a feature flag. This allowed a RabbitMQ cluster to be upgraded one node at a time, without having to stop the entire cluster.
The compatibility code is in the wild for long enough. The
implicit_default_bindings
feature flag was marked as required in aprevious commit (see #5202). This allows us to remove code in this patch.
References #5215.
Note that we rely here on dirty Mnesia operations of the removed migration function to have done its job (of removing default exchange binding rows).