Python-tldap

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* Bug fixes.

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* Update referenced backend names.
* Rewrite method functions.
* Fix creating gid and uid for different servers.
* Updates to 389 support.

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* Rename backends.
tldap.backend.transaction to tldap.backend.fake_transactions
tldap.backend.python to tldap.backend.no_transactions
* Remove prefixes from LDAP names.

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* New methods submodule, moved from placard schema.
* Add depends on python-ldap.
* Fix LDAP bind if connection failed.
* Fix md5-crypt password comparison.
* Write LDAP entries to ldif_writer.

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* Tests: Purge environment when calling slapd.
* Update description to reflect what tldap does.

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* Support new method of creating schemas.