Rui Chen bc5ddf1e6a Fix batch deleting issue in volume_type.unset_keys()
cinderclient volume_type.unset_keys() only delete the first key even if
multiple keys are applied. The response of manager._delete() is tuple object,
it is not "None" if the deleting success, so the batch operation would
be broken when the first key is deleted successfully. The patch fix this
issue.

Change-Id: I60378a32cdc52aacdf869d69b246dec7eb6cdb77
Closes-Bug: #1596511
2016-07-06 15:15:35 +08:00
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