Fixed liblmdb nested split (ITS#7592)
Fixed liblmdb overflow page behavior (ITS#7620)
Fixed liblmdb race condition with read and write txns (ITS#7635)
+ Fixed liblmdb mdb_del behavior with MDB_DUPSORT and mdb_del (ITS#7658)
Fixed slapd cn=config with unknown schema elements (ITS#7608)
Fixed slapd cn=config with loglevel 0 (ITS#7611)
Fixed slapd slapi filterlist free behavior (ITS#7636)