ovpn.cnf: Removal of SKID & AKID from server section - Fixes Bug#13595

ovpn.cnf: Removal of SKID & AKID from server section - Fixes Bug#13595

- The update to openssl-3.2.x introduced a bug fix which now gives an error if the
   subjectKeyIdentifier (SKID) or authorityKeyIdentifier (AKID) is in the x509 extensions
   for a CSR.
- See the following discssion in the openssl github issues
   https://github.com/openssl/openssl/issues/22966#issuecomment-1858396738
- The SKID & AKID should never have been specified in the CSR but due to a bug they were
   never flagged with an error, just ignored. Since the bug fix for that bug was put into
   OpenSSL-3.2.0 the prescence of the SKID & AKID in the CSR causes an error to be flagged.
- The consequence of this is that in CU183 trying to create a new x509 root/host
   certificate gives an error when the CSR is generated so only the root certificate is
   created and not the host certificate.
- Tested out the removal of the SKID & AKID lines from the [ server ] section of the
   ovpn.cnf file and the root/host certificate set was created without any issue.
- Then tested the creation of a RW client connection and that worked with no problems. Also
   creating a fresh N2N connection worked without any problems.
- Also tested restoring from an earlier backup. The RW and N2N connections worked without
   issues with the AKID and SKID missing from the [ server ] section.
- It would be good if this could be merged into CU184 for final testing.

Fixes: Bug#13595
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>