Thank you for update.
Have few queries on this. Could you please clarify them?
1) Is there any reason for dropping Mozilla NSS support with latest versions of OpenLDAP?
2) Can we compile OpenLDAP 2.6.8 by taking 'tls_m.c' module from OpenLDAP 2.4.59 (where OpenLDAP support NSS) and use NSS certdb for TLS communication? Is it possible to use seamlessly?