[SAC] [OSGeo] #1675: Add "last bind" record to LDAP database

#1675: Add "last bind" record to LDAP database
Reporter: strk | Owner: sac@…
     Type: task | Status: new
Priority: normal | Milestone:
Component: Systems Admin | Keywords: ldap
We need a way to tell when a user was last active in LDAP.
I believe the closest match is when the user was last authenticated, even
if services will possibly not contact LDAP again when authenticated
sessions are alive.

Searching on the web I stumbled upon what looks like being an addon for
slapd that adds this information:

Ticket URL: <https://trac.osgeo.org/osgeo/ticket/1675&gt;
OSGeo <http://www.osgeo.org/&gt;
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