OpenLDAP uses a forked snacc to provide two functions of decode

[apconole]

This bug is to enhance esnacc so that OpenLDAPs fork is no longer needed, and they can come off of mainline again.

[apconole]

Quick update - this requires gser encode/decode support. To get this right, we need to have it working in both the C and C++ libraries, as well as part of the back-end support (not much needed, but some).