Revert exception message change, rename "response" variable to "result" and add additional clarification to the docstring.
Revert exception message change, rename "response" variable to "result" and
add additional clarification to the docstring.

apache/libcloud,wido/libcloud,wrigri/libcloud,ByteInternet/libcloud,samuelchong/libcloud,ZuluPro/libcloud,jimbobhickville/libcloud,mistio/libcloud,wido/libcloud,wuyuewen/libcloud,StackPointCloud/libcloud,t-tran/libcloud,samuelchong/libcloud,Scalr/libcloud,pquentin/libcloud,t-tran/libcloud,mistio/libcloud,t-tran/libcloud,supertom/libcloud,Scalr/libcloud,watermelo/libcloud,niteoweb/libcloud,techhat/libcloud,wrigri/libcloud,DimensionDataCBUSydney/libcloud,Kami/libcloud,cryptickp/libcloud,niteoweb/libcloud,pquentin/libcloud,illfelder/libcloud,wrigri/libcloud,Kami/libcloud,iPlantCollaborativeOpenSource/libcloud,illfelder/libcloud,watermelo/libcloud,techhat/libcloud,samuelchong/libcloud,wuyuewen/libcloud,erjohnso/libcloud,DimensionDataCBUSydney/libcloud,Scalr/libcloud,curoverse/libcloud,SecurityCompass/libcloud,mgogoulos/libcloud,mathspace/libcloud,iPlantCollaborativeOpenSource/libcloud,wido/libcloud,jimbobhickville/libcloud,apache/libcloud,mgogoulos/libcloud,supertom/libcloud,NexusIS/libcloud,NexusIS/libcloud,NexusIS/libcloud,niteoweb/libcloud,curoverse/libcloud,supertom/libcloud,lochiiconnectivity/libcloud,andrewsomething/libcloud,vongazman/libcloud,vongazman/libcloud,ZuluPro/libcloud,apache/libcloud,andrewsomething/libcloud,vongazman/libcloud,curoverse/libcloud,SecurityCompass/libcloud,jimbobhickville/libcloud,ByteInternet/libcloud,andrewsomething/libcloud,illfelder/libcloud,mgogoulos/libcloud,techhat/libcloud,ByteInternet/libcloud,SecurityCompass/libcloud,erjohnso/libcloud,iPlantCollaborativeOpenSource/libcloud,ZuluPro/libcloud,lochiiconnectivity/libcloud,StackPointCloud/libcloud,Kami/libcloud,erjohnso/libcloud,wuyuewen/libcloud,cryptickp/libcloud,mathspace/libcloud,StackPointCloud/libcloud,mathspace/libcloud,watermelo/libcloud,mistio/libcloud,lochiiconnectivity/libcloud,DimensionDataCBUSydney/libcloud,cryptickp/libcloud,pquentin/libcloud