GUI-576: Optimize CLC fetches for instances on volumes landing page to avoid one fetch per attached volume.  Display instance name in detach volume from instance dialog on volumes landing page.
Fix copy-paste error
GUI-576: Minor optimization--also filter instances by the avail zone selected for the volumes filter.
Merge pull request #404 from eucalyptus/GUI-576

GUI-576: Display instance name in detach volume from instance dialog on volumes landing page.