Added vpc_id filter on the instance landing page
Added vpc_id filter to the security group landing page
Added the VPC domain filter on the ip address landing page
Added vpc_zone_identifier filter on the scaling group landing page
Update the VPC filter label from 'VPC' to 'Scope' on the ip address landing page
Handle the case where the scaling group's vpc_zone_identifier attribute is None
Adjusted the order of the filter display
Added 'No VPC' as a filter option for the instance and security group landing pages
Added the No VPC option to the scaling group filter
Sorted the VPC list for the landing pages
Added the VPC subnet filter on the instance landing page
Maked the filtering for 'None' option generic
Fixed a bug where No VPC scailing group was failing to update due to the missing VPC subnet field
Fixed the mistake from the previous commit
Fixed the label from 'No VPC' to 'No subnets' on the scaling group landing page filter
Adjusted the behavior of the VPC subnet filter on the scaling group landing page to be matched with the other filters
Fixed the broken availability zones filter on the scaling group landing page
Fixed for pep8 compliance
updated security group label for consistency
Merge pull request #918 from eucalyptus/GUI-1252

Gui 1252 VPC filters on the landing pages