BUG #17354: pg_hba_file_rules always shows verify-ca when auth_method=cert

The following bug has been logged on the website:

Bug reference:      17354
Logged by:          Feike Steenbergen
Email address:      feikesteenbergen@gmail.com
PostgreSQL version: 10.0
Operating system:   Ubuntu x86_64
Description:

When adding a line to my pg_hba.conf as follows:

hostssl all all all cert clientcert=verify-full

It baffled me that pg_hba_file_rules showed me the following entry:

line_number | 106
type        | hostssl
database    | {all}
user_name   | {all}
address     | all
netmask     | (null)
auth_method | cert
options     | {clientcert=verify-ca}
error       | (null)

Which AFAIK, authentication method cert implies verify-full nowadays
(PG14).
I've observed this on PostgreSQL 14 and 13, my guess is that this piece of
code:

src/backend/libpq/hba.c

    /*
     * Enforce any parameters implied by other settings.
     */
    if (parsedline->auth_method == uaCert)
    {
        parsedline->clientcert = clientCertCA;
    }

Is the culprit as it seems to set clientcert=verify-ca unconditionally.

As my C hacking skills are almost non-existent, I dared not write a patch
myself for this one.