CASSANDRA-21546: Support pluggable default role initialization - #4990
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This reverts commit cdf8332.
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Description
Cassandra bootstraps every new cluster with a hardcoded cassandra superuser whose password is also cassandra, so credential operators must remember to rotate.
This PR adds
IDefaultRoleInitializer, a pluggable strategy for bootstrapping the initial role, configured via a newdefault_role_initializeroption in cassandra.yaml:PasswordDefaultRoleInitializer(default): same behavior as today, role/password now configurable.MutualTlsDefaultRoleInitializer: creates the superuser with no password, mapping a client cert identity instead. Rejected at startup if the authenticator doesn't support MTLS.patch by Aparna Naik; reviewed by for CASSANDRA-21546