ldap_server: Enable server side sorting extension

roles/ldap_server/templates/slapd.conf.j2

@@ -40,6 +40,7 @@ moduleload syncprov.la
 #moduleload smbkrb5pwd.la
 moduleload constraint.la
 moduleload memberof.la
+moduleload sssvlv.la
 
 # certificates and ciphers (unfortunately modern cipher suite didn't work)
 TLSCertificateFile {{ tls_certs }}/{{ ldap_server_cert }}.crt