ITS#10149 - Allow certificates and keys to be read from URIs

Graham Leggettrequested to merge
minfrin/openldap:tlsuri2 into master

Add the LDAP_OPT_X_TLS_URIS and LDAP_OPT_X_TLS_CACERTURIS options to allow certificates and keys to be set using OpenSSL provider URIs.

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