s4:kdc:db-glue altSecurityIdentities DN and serial reversed

When altSecurityIdentities is set from RSAT / ADUC it stores the Issuer and Subject DN in last to first order i.e. CN=Common Name, O=Organization, C=Country Need to reverse that to first to last order, i.e. C=Country, O=Organization, CN=Common name Which is how they're stored on the X509 certificates.

Also the serial number is stored in reverse order.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=16001

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • (optional) This MR is just one part towards a larger feature.
  • (optional, if backport required) Bugzilla bug filed and BUG: tag added
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • CI timeout is 3h or higher (see Settings/CICD/General pipelines/ Timeout)

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to README.Coding.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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