DEVEL15-windows-btree-dir-enum-20090126

DEVEL15-windows-btree-dir-enum-20090126

LICENSE MIT

Modify the cm_BPlusDirEnum interface:

* add the cm_scache_t * of the directory being enumerated to the
  cm_direnum_t object

* remove the cm_scache_t * from the cm_BPlusDirEnumBulkStat call
  now that it is part of the cm_direnum_t object

* maintain a reference to the cm_scache_t for the life of the
  cm_direnum_t object.  This ensures that the object cannot be
  recycled while the enumeration is in use.

(cherry picked from commit e42a066da153750077b154e27249b5b4862724db)