Change the froce delete volume flage to True

The ProphetStor storage volume unable to remove if this has
assignee on other service or application. We make sure the volume
created by the cinder, and the cinder has the privileges to delete
volume.

Change-Id: I06fa7097f4c2320c346e286b0e0fc73ada1c7f8e
Closes-Bug: 1357629
Merge "Change the froce delete volume flage to True"