This is a general purpose implementation to get X.509 certificates and CRLs
from a LDAP location.
At first a search is performed in the ldap*AttributeNames of the
X509LDAPCertStoreParameters with the given
information of the subject (for all kind of certificates) or issuer (for
CRLs), respectively, if a X509CertSelector is given with that details. For
CRLs, CA certificates and cross certificates a coarse search is made only for
entries with that content to get more possibly matchign results.