MEDIUM: ssl/crtlist: loading crt-store keywords from a crt-list

MEDIUM: ssl/crtlist: loading crt-store keywords from a crt-list

This patch allows the usage of "crt-store" keywords from a "crt-list".

The crtstore_parse_load() function was splitted into 2 functions, so the
keywords parsing is done in ckch_conf_parse().

With this patch, crt are loaded with ckch_store_new_load_files_conf() or
ckch_store_new_load_files_path() depending on weither or not there is a
"crt-store" keyword.

More checks need to be done on "crt" bind keywords to ensure that
keywords are compatible.

This patch does not introduce the feature on the CLI.