Re: disabled SSL log_like tests

If you run the not-yet-enabled-by-default OpenBSD CI task on master,
ssl/001_ssltests fails in "intermediate client certificate is
untrusted", recently uncommented by commit e0f373ee. I think it might
be telling us that LibreSSL's x509_store_ctx_get_current_cert() is
giving us the client certificate (ie chain depth 0) instead of the
intermediate certificate, even though X509_STORE_CTX_get_error_depth()
returned 1 as expected. I don't know why it would do that, given the
documentation:

X509_STORE_CTX_get_current_cert() returns the certificate in ctx which
caused the error or NULL if no certificate is relevant.

The explanation is probably in here somewhere, but I don't understand
these things:

https://github.com/openbsd/src/blob/master/lib/libcrypto/x509/x509_vfy.c
https://github.com/openssl/openssl/blob/master/crypto/x509/x509_vfy.c

[17:55:28.888] # Failed test 'intermediate client certificate is
untrusted: log matches'
[17:55:28.888] # at
/home/postgres/postgres/src/test/perl/PostgreSQL/Test/Cluster.pm line
2667.
[17:55:28.888] # '2025-05-05 17:55:28.353 UTC
[10009][postmaster] DEBUG: assigned pm child slot 1 for backend
[17:55:28.888] # 2025-05-05 17:55:28.354 UTC [10009][postmaster]
DEBUG: forked new client backend, pid=27624 socket=8
[17:55:28.888] # 2025-05-05 17:55:28.355 UTC [27624][not initialized]
[[unknown]][:0] LOG: connection received: host=localhost port=11357
[17:55:28.888] # 2025-05-05 17:55:28.374 UTC [27624][not initialized]
[[unknown]][:0] LOG: could not accept SSL connection: certificate
verify failed
[17:55:28.888] # 2025-05-05 17:55:28.374 UTC [27624][not initialized]
[[unknown]][:0] DETAIL: Client certificate verification failed at
depth 1: unable to get local issuer certificate.
[17:55:28.888] # Failed certificate data (unverified): subject
"/CN=ssltestuser", serial number 2315702411956921344, issuer "/CN=Test
CA for PostgreSQL SSL regression test client certs".
[17:55:28.888] # 2025-05-05 17:55:28.374 UTC [27624][not initialized]
[[unknown]][:0] DEBUG: SSL connection from DN:"(anonymous)"
CN:"(anonymous)"
[17:55:28.888] # 2025-05-05 17:55:28.377 UTC [10009][postmaster]
DEBUG: releasing pm child slot 1
[17:55:28.888] # 2025-05-05 17:55:28.377 UTC [10009][postmaster]
DEBUG: client backend (PID 27624) exited with exit code 0
[17:55:28.888] # '
[17:55:28.888] # doesn't match '(?^:Failed certificate data
\(unverified\): subject "/CN=Test CA for PostgreSQL SSL regression
test client certs", serial number \d+, issuer "/CN=Test root CA for
PostgreSQL SSL regression test suite")'
[17:55:28.888] # Looks like you failed 1 test of 240.

https://cirrus-ci.com/task/4708964002168832?logs=test_world#L345
https://api.cirrus-ci.com/v1/artifact/task/4708964002168832/testrun/build/testrun/ssl/001_ssltests/log/regress_log_001_ssltests
https://api.cirrus-ci.com/v1/artifact/task/4708964002168832/testrun/build/testrun/ssl/001_ssltests/log/001_ssltests_primary.log