Fix s3 multipart test cases broken by LIBCLOUD-378
Fix s3 multipart test cases broken by LIBCLOUD-378

The breakage was caused by an overzealous check.
Also added test cases for checking small and big uploads via
S3 multipart upload API

thesquelched/libcloud,SecurityCompass/libcloud,sergiorua/libcloud,DimensionDataCBUSydney/libcloud,Scalr/libcloud,supertom/libcloud,wuyuewen/libcloud,wido/libcloud,mistio/libcloud,erjohnso/libcloud,dcorbacho/libcloud,watermelo/libcloud,sfriesel/libcloud,DimensionDataCBUSydney/libcloud,watermelo/libcloud,carletes/libcloud,samuelchong/libcloud,MrBasset/libcloud,lochiiconnectivity/libcloud,ByteInternet/libcloud,cloudControl/libcloud,techhat/libcloud,mathspace/libcloud,watermelo/libcloud,smaffulli/libcloud,cryptickp/libcloud,sahildua2305/libcloud,StackPointCloud/libcloud,sgammon/libcloud,Verizon/libcloud,sahildua2305/libcloud,cryptickp/libcloud,lochiiconnectivity/libcloud,Itxaka/libcloud,sfriesel/libcloud,munkiat/libcloud,mgogoulos/libcloud,lochiiconnectivity/libcloud,aviweit/libcloud,jimbobhickville/libcloud,vongazman/libcloud,ZuluPro/libcloud,jerryblakley/libcloud,curoverse/libcloud,andrewsomething/libcloud,ZuluPro/libcloud,Verizon/libcloud,mbrukman/libcloud,sfriesel/libcloud,jimbobhickville/libcloud,SecurityCompass/libcloud,wrigri/libcloud,Itxaka/libcloud,kater169/libcloud,wrigri/libcloud,sgammon/libcloud,StackPointCloud/libcloud,vongazman/libcloud,erjohnso/libcloud,MrBasset/libcloud,niteoweb/libcloud,DimensionDataCBUSydney/libcloud,kater169/libcloud,munkiat/libcloud,jerryblakley/libcloud,aleGpereira/libcloud,wuyuewen/libcloud,Scalr/libcloud,apache/libcloud,supertom/libcloud,t-tran/libcloud,mathspace/libcloud,pantheon-systems/libcloud,sergiorua/libcloud,jimbobhickville/libcloud,carletes/libcloud,t-tran/libcloud,mbrukman/libcloud,techhat/libcloud,aviweit/libcloud,NexusIS/libcloud,MrBasset/libcloud,sergiorua/libcloud,JamesGuthrie/libcloud,Kami/libcloud,andrewsomething/libcloud,cryptickp/libcloud,ZuluPro/libcloud,vongazman/libcloud,illfelder/libcloud,mgogoulos/libcloud,atsaki/libcloud,t-tran/libcloud,marcinzaremba/libcloud,niteoweb/libcloud,curoverse/libcloud,marcinzaremba/libcloud,mtekel/libcloud,marcinzaremba/libcloud,wrigri/libcloud,Kami/libcloud,carletes/libcloud,atsaki/libcloud,JamesGuthrie/libcloud,mbrukman/libcloud,samuelchong/libcloud,mistio/libcloud,jerryblakley/libcloud,iPlantCollaborativeOpenSource/libcloud,sahildua2305/libcloud,supertom/libcloud,niteoweb/libcloud,Scalr/libcloud,aleGpereira/libcloud,NexusIS/libcloud,andrewsomething/libcloud,schaubl/libcloud,pantheon-systems/libcloud,NexusIS/libcloud,JamesGuthrie/libcloud,briancurtin/libcloud,wuyuewen/libcloud,erjohnso/libcloud,wido/libcloud,aleGpereira/libcloud,illfelder/libcloud,ByteInternet/libcloud,thesquelched/libcloud,Itxaka/libcloud,techhat/libcloud,ClusterHQ/libcloud,mtekel/libcloud,aviweit/libcloud,smaffulli/libcloud,cloudControl/libcloud,thesquelched/libcloud,dcorbacho/libcloud,schaubl/libcloud,ClusterHQ/libcloud,briancurtin/libcloud,kater169/libcloud,pquentin/libcloud,pantheon-systems/libcloud,atsaki/libcloud,apache/libcloud,StackPointCloud/libcloud,dcorbacho/libcloud,pquentin/libcloud,Cloud-Elasticity-Services/as-libcloud,smaffulli/libcloud,Verizon/libcloud,illfelder/libcloud,schaubl/libcloud,pquentin/libcloud,Cloud-Elasticity-Services/as-libcloud,iPlantCollaborativeOpenSource/libcloud,mathspace/libcloud,briancurtin/libcloud,mgogoulos/libcloud,samuelchong/libcloud,curoverse/libcloud,iPlantCollaborativeOpenSource/libcloud,mtekel/libcloud,ByteInternet/libcloud,cloudControl/libcloud,mistio/libcloud,Kami/libcloud,Cloud-Elasticity-Services/as-libcloud,apache/libcloud,munkiat/libcloud,wido/libcloud,SecurityCompass/libcloud