FIX: ldap_authentication.sh

Summary

Fix ldap_authentication.sh script caosdb/internal/all#585

Focus

The idea of the script stays the same but this fix is nearly a complete rewrite.

Note that the answer of ldapwhoami is checked even if the script returned with exit code 0 because especially MS Active Directory is rather sloppy with the binding and returns "" and exit code 0 when passing an empty password.

Also, since MS Active Directory has a unusual DN format in the request and an unusual response format, the script has been improved to adapt to both normal LDAP behavior (e.g. OpenLDAP server) and MS Active Directory misbehavior.

Test Environment

• Tested manually with an Active Directory server @henrik
• Tested manually with OpenLDAP @timm

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