ignore s3_bucket_location if set to "", pass "*" as "" (wildcard), pass others as-is
ignore s3_bucket_location if set to "", pass "*" as "" (wildcard), pass others as-is

git-svn-id: 1ec2f18686fdc358f4c056ef827940a32f9c95e3@1806 a8d146d6-cc15-0410-8900-af154a0219e0

zmanda/libzcloud,zmanda/libzcloud