GUI-771: Leverage filters instead of passing volume_ids param to snapshots fetch for AWS compatibility.

Note that get_all_volumes(volume_ids=volume_ids) fails on AWS if any of the volumes a snapshot was created from has since been deleted.
GUI-771: Prevent volume detail page from throwing an error when transitioning from deleting to deleted state, and add styles to display the deleting/deleted state.  Minor style fix for disabled button state.
Merge pull request #595 from eucalyptus/GUI-771

GUI-771: Fix snapshots landing page failure on AWS when a snapshot's volume has been deleted