GUI-554
improved error handling. wrapped some things in try/except, call common functions for error handling/parsing
resolved conflict
GUI-600: Display instance name in relevant dialogs on instances landing page.
Merge pull request #407 from eucalyptus/GUI-600

GUI-600: Display instance name in relevant dialogs on instances landing page
introducing the boto_error_handler
merged the generator branch
merged develop
GUI-600: Optimize snapshot and instance fetches for volumes landing page.
Merge pull request #409 from eucalyptus/GUI-600-redux

GUI-600: Optimize snapshot and instance fetches for volumes landing page
GUI-554
converted views to use error handling generator
Optimize CLC fetch for volumes on snapshots landing page, fetching only the volumes relevant for the given snapshots.
GUI-554
minor cleanup based on code review
resolved conflicts with develop
Removing the condition for displaying the release IP option on the IP address landing page's tile view
GUI-554
changed up logic for fetching user/group totals
GUI-554: Leverage error handler context manager when fetching image for launch instance and launch config wizards
GUI-554: Restore generic context-based BotoServerError handler.  Minor PEP8 cleanup
Removing the chosen destroy call when resetting the widger on the dialog close event
GUI-554: Fix reference to missing "queue" var. Remove unused import, and minor PEP8 cleanup
GUI-554: Remove unused imports