- add support in rlm_ldap for reading clients from ldap
    - fix TLS parameter controling if a cert which fails to validate will be
        accepted (i.e. self-signed), rlm_ldap config parameter=tls_require_cert
        ldap LDAP_OPT_X_TLS_REQUIRE_CERT parameter was being passed to
        ldap_set_option() when it should have been ldap_int_tls_config()