Merge pull request #409 from terrafrost/stat-cache-fix

SFTP: add unit test for stat cache fix

* terrafrost/stat-cache-fix:
  SFTP: return $sftp object in new unit test method
  SFTP: add unit test for stat cache fix
Merge branch 'master' into php5

* master:
  SFTP: return $sftp object in new unit test method
  SFTP: add unit test for stat cache fix