Add builders for LDAP users and groups.

(cherry picked from commit 0e039d9b969845c5b1b7342a54e3b6ef083c81e4)
Add some basic tests for OGDSUpdater.

(cherry picked from commit 1ccb96677a9aff767c7d1c321d7ef6a41fb12a5d)
Fix Unicode handling in OGDSUpdater.

(cherry picked from commit 3607eb8ec31222da8be7d0b7543c614c83d1e93c)

Conflicts:
	docs/HISTORY.txt