dirmngr: Implement trust classes for the cert cache.

* dirmngr/certcache.h (CERTTRUST_CLASS_SYSTEM): New.
(CERTTRUST_CLASS_CONFIG): New.
(CERTTRUST_CLASS_HKP): New.
(CERTTRUST_CLASS_HKPSPOOL): New.
* dirmngr/certcache.c (MAX_EXTRA_CACHED_CERTS): Rename to ...
(MAX_NONPERM_CACHED_CERTS): this.
(total_extra_certificates): Rename to ...
(total_nonperm_certificates): this.
(total_config_certificates): Remove.
(total_trusted_certificates): Remove.
(total_system_trusted_certificates): Remove.
(cert_item_s): Remove field 'flags'.  Add fields 'permanent' and
'trustclasses'.
(clean_cache_slot): Clear new fields.
(put_cert): Change for new cert_item_t structure.
(load_certs_from_dir): Rename arg 'are_trusted' to 'trustclass'
(load_certs_from_file): Use CERTTRUST_CLASS_ value for put_cert.
(load_certs_from_w32_store): Ditto.
(cert_cache_init): Ditto.
(cert_cache_print_stats): Rewrite.
(is_trusted_cert): Replace arg 'with_systrust' by 'trustclasses'.
Chnage the test.
* dirmngr/validate.c (allowed_ca): Pass CERTTRUST_CLASS_CONFIG to
is_trusted_cert.
(validate_cert_chain): Pass CERTTRUST_CLASS_ values to
is_trusted_cert.
--

These trust classes make it easier to select certain sets of root
certificates.

Signed-off-by: Werner Koch <[email protected]>

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