Set error state when unshelve an instance due to not found image

If shelve image created by shelve operation can not be found when
unshelve, nova should set the instance error state.

This patch add a new param show_deleted to glance api:
:param show_deleted: (Optional) show the image even the status of
                     image is deleted.

Change-Id: Ie4bc8dfec0922023dd1a4204a67acd77f7bb0498
Closes-Bug: 1371406
Merge "Set error state when unshelve an instance due to not found image"