EMS Refresh of Amazon Virtualization Type

https://bugzilla.redhat.com/show_bug.cgi?id=1133780

This is the code changes to populate the hardwares and flavors
table with the virtualization type for Amazon Images and for the Amazon
flavor types. 2 new columns have been added to the flavors table and
a single column has been added to the hardwares table
The virtualization type is documented on the amazon web page at
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/virtualization_types.html
Minor, but I've been trying to keep properties above relationships.  Can you move this up to just below "bitness"?