add changes for #847
add changes for #847

andrewsomething/libcloud,erjohnso/libcloud,apache/libcloud,iPlantCollaborativeOpenSource/libcloud,ByteInternet/libcloud,vongazman/libcloud,ZuluPro/libcloud,samuelchong/libcloud,mistio/libcloud,mgogoulos/libcloud,NexusIS/libcloud,watermelo/libcloud,andrewsomething/libcloud,techhat/libcloud,pquentin/libcloud,Scalr/libcloud,techhat/libcloud,erjohnso/libcloud,ByteInternet/libcloud,NexusIS/libcloud,vongazman/libcloud,StackPointCloud/libcloud,erjohnso/libcloud,ByteInternet/libcloud,Kami/libcloud,apache/libcloud,SecurityCompass/libcloud,illfelder/libcloud,Scalr/libcloud,NexusIS/libcloud,illfelder/libcloud,mistio/libcloud,ZuluPro/libcloud,apache/libcloud,vongazman/libcloud,t-tran/libcloud,StackPointCloud/libcloud,Kami/libcloud,t-tran/libcloud,iPlantCollaborativeOpenSource/libcloud,watermelo/libcloud,SecurityCompass/libcloud,mgogoulos/libcloud,t-tran/libcloud,StackPointCloud/libcloud,samuelchong/libcloud,illfelder/libcloud,mistio/libcloud,mgogoulos/libcloud,watermelo/libcloud,ZuluPro/libcloud,andrewsomething/libcloud,SecurityCompass/libcloud,Kami/libcloud,samuelchong/libcloud,pquentin/libcloud,Scalr/libcloud,iPlantCollaborativeOpenSource/libcloud,techhat/libcloud,pquentin/libcloud