Deploy Dual Stack OpenLDAP Server 2.4 with SASL on FreeBSD 10.3

OpenLDAP is a very popular and well implemented server for LDAPv3. It runs best on FreeBSD or Linux. This recipe shows how to deploy OpenLDAP with SASL on FreeBSD 10.3, with full dual stack support. Of course, the FreeBSD must be Dual Stack for the OpenLDAP to be Dual Stack.