GUI-822: Optimize launch configs landing page to avoid a security group API fetch per item
GUI-822: Return 404 page when security group lookup by id or name fails
GUI-822: Prevent redirect loop when security lookup fails on AWS.  Remove errant vpc id filter to allow security groups landing page to load on AWS
GUI-822: Reverting removal of VPC filter for security groups landing page.  Will address in a separate ticket/branch.
Merge pull request #618 from eucalyptus/GUI-822

GUI-822: Optimize launch configs landing page to avoid a security group API fetch per item