Finished partial fix in 91f405c9fedf24822015172e9e3c50acbd855d28.
JCLOUDS-774 cleanup derived location suppliers and backfill test for inconsistent region and zone mappings.
Revert 428b2bd2ea2d73354e15ffad52516105b15576cd as this hides inconsistency between regions and zones.
JCLOUDS-774 ec2 api was ignoring the jclouds.region property, which made exceptions possible on all zone-scoped api calls.