back-ndb: retire for 2.5?

[Quanah Gibson-Mount]

The back-ndb backend has never been finished, and relies on partnership 
with a corporation that has no desire to continue the work since it 
acquired the original entity involved.

I would suggest then that it be removed from the 2.5 release tree and left 
master only.

--Quanah

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Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>