Update Route53 driver so the _to_record doesn't throw an exception if a response is missing TTL attribute.
Update Route53 driver so the _to_record doesn't throw an exception if a response
is missing TTL attribute.

mathspace/libcloud,t-tran/libcloud,samuelchong/libcloud,Scalr/libcloud,ZuluPro/libcloud,SecurityCompass/libcloud,mistio/libcloud,carletes/libcloud,andrewsomething/libcloud,pquentin/libcloud,watermelo/libcloud,wuyuewen/libcloud,NexusIS/libcloud,schaubl/libcloud,Kami/libcloud,mtekel/libcloud,ZuluPro/libcloud,Scalr/libcloud,wido/libcloud,sahildua2305/libcloud,schaubl/libcloud,DimensionDataCBUSydney/libcloud,mtekel/libcloud,t-tran/libcloud,wrigri/libcloud,niteoweb/libcloud,mtekel/libcloud,schaubl/libcloud,techhat/libcloud,niteoweb/libcloud,MrBasset/libcloud,smaffulli/libcloud,jerryblakley/libcloud,t-tran/libcloud,illfelder/libcloud,MrBasset/libcloud,jimbobhickville/libcloud,cryptickp/libcloud,supertom/libcloud,aleGpereira/libcloud,StackPointCloud/libcloud,mathspace/libcloud,vongazman/libcloud,techhat/libcloud,lochiiconnectivity/libcloud,cryptickp/libcloud,ByteInternet/libcloud,mathspace/libcloud,aleGpereira/libcloud,andrewsomething/libcloud,samuelchong/libcloud,mgogoulos/libcloud,pquentin/libcloud,apache/libcloud,StackPointCloud/libcloud,curoverse/libcloud,apache/libcloud,ByteInternet/libcloud,erjohnso/libcloud,wrigri/libcloud,jerryblakley/libcloud,apache/libcloud,DimensionDataCBUSydney/libcloud,iPlantCollaborativeOpenSource/libcloud,atsaki/libcloud,mgogoulos/libcloud,wrigri/libcloud,Kami/libcloud,mistio/libcloud,supertom/libcloud,jimbobhickville/libcloud,supertom/libcloud,watermelo/libcloud,curoverse/libcloud,NexusIS/libcloud,samuelchong/libcloud,atsaki/libcloud,cryptickp/libcloud,erjohnso/libcloud,sahildua2305/libcloud,erjohnso/libcloud,DimensionDataCBUSydney/libcloud,Kami/libcloud,sahildua2305/libcloud,mistio/libcloud,carletes/libcloud,illfelder/libcloud,lochiiconnectivity/libcloud,mbrukman/libcloud,mbrukman/libcloud,mgogoulos/libcloud,pantheon-systems/libcloud,wido/libcloud,wuyuewen/libcloud,wido/libcloud,pquentin/libcloud,lochiiconnectivity/libcloud,curoverse/libcloud,techhat/libcloud,Scalr/libcloud,ZuluPro/libcloud,smaffulli/libcloud,carletes/libcloud,MrBasset/libcloud,andrewsomething/libcloud,wuyuewen/libcloud,SecurityCompass/libcloud,smaffulli/libcloud,iPlantCollaborativeOpenSource/libcloud,ByteInternet/libcloud,StackPointCloud/libcloud,niteoweb/libcloud,iPlantCollaborativeOpenSource/libcloud,vongazman/libcloud,watermelo/libcloud,pantheon-systems/libcloud,jimbobhickville/libcloud,illfelder/libcloud,vongazman/libcloud,mbrukman/libcloud,SecurityCompass/libcloud,pantheon-systems/libcloud,atsaki/libcloud,jerryblakley/libcloud,aleGpereira/libcloud,NexusIS/libcloud