cloudImageMetadataSuite.TestSaveDiffMetadataConcurrentlyAndOrderByDateCreated wrong order

As seen in
   http://reports.vapour.ws/releases/issue/57236999749a5640b3aab63b

cloudImageMetadataSuite.TestSaveDiffMetadataConcurrentlyAndOrderByDateCreated wrong order on windows using go 1.6

c.Assert(metadata, jc.DeepEquals, groups)
... obtained map[string][]cloudimagemetadata.Metadata = map[string][]cloudimagemetadata.Metadata{"":[]cloudimagemetadata.Metadata{cloudimagemetadata.Metadata{MetadataAttributes:cloudimagemetadata.MetadataAttributes{Stream:"stream", Region:"", Version:"14.04", Series:"trusty", Arch:"arch", VirtType:"", RootStorageType:"", RootStorageSize:(*uint64)(nil), Source:""}, Priority:0, ImageId:"0"}, cloudimagemetadata.Metadata{MetadataAttributes:cloudimagemetadata.MetadataAttributes{Stream:"scream", Region:"", Version:"14.04", Series:"trusty", Arch:"arch", VirtType:"", RootStorageType:"", RootStorageSize:(*uint64)(nil), Source:""}, Priority:0, ImageId:"1"}}}
... expected map[string][]cloudimagemetadata.Metadata = map[string][]cloudimagemetadata.Metadata{"":[]cloudimagemetadata.Metadata{cloudimagemetadata.Metadata{MetadataAttributes:cloudimagemetadata.MetadataAttributes{Stream:"scream", Region:"", Version:"14.04", Series:"trusty", Arch:"arch", VirtType:"", RootStorageType:"", RootStorageSize:(*uint64)(nil), Source:""}, Priority:0, ImageId:"1"}, cloudimagemetadata.Metadata{MetadataAttributes:cloudimagemetadata.MetadataAttributes{Stream:"stream", Region:"", Version:"14.04", Series:"trusty", Arch:"arch", VirtType:"", RootStorageType:"", RootStorageSize:(*uint64)(nil), Source:""}, Priority:0, ImageId:"0"}}}
... mismatch at [""][0].MetadataAttributes.Stream: unequal; obtained "stream"; expected "scream"