NAS-129123 / 24.10 / Expand error recovery in AD health checks #13781
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This primarily adds two new features to our AD health checks
Check whether the secrets.tdb file exists and has a valid machine account password. If it's missing, then try to restore from backup.
Check whether we have a stored kerberos keytab for the AD domain. If it's missing, reconstruct it from our machine account password in the secrets.tdb file.
This commit also refactors the kerberos plugin to move many methods into general-purpose krb5 utils that can be tested more easily in isolation.