Failed to re-detach volume when volume detached.

When first request command detach the volume, but the back-end
storage state is in-processing or busy. Next retry command will
got the error code that describe the volume already detached.

Change-Id: If340980ab2dcc844398254ff368ca6b78ca40ff6
Closes-Bug: 1373317
Merge "Failed to re-detach volume when volume detached."