Log Message:
Changes 2.4.38:

Lib/slapdtest.py
* SlapdObject now evaluates env var SLAPD for optionally pointing
  to OpenLDAP's slapd executable (e.g. with OpenLDAP LTB builds)
* added LDAPI support in slaptest.SlapdObject which is internally used
  in methods ldapadd() and ldapwhoami()
* added method slaptest.SlapdObject.ldapmodify()
* fixed enabling logger in slaptest
* directory name now contains port to be able to run several SlapdObject
  instances side-by-side (e.g. with replication)
* added authz-regexp mapping to rootdn for user running the test
* internally use SASL/EXTERNAL via LDAPI to bind
* SlapdObject.server_id used as serverID in slapd.conf for MMR
* Removed method SlapdObject.started() because SlapdTestCase.setUpClass()
  will be used to add initial entries

Tests/
* ReconnectLDAPObject is also tested by sub-classing test class