Use six.moves cStringIO instead of cStringIO
Use six.moves cStringIO instead of cStringIO

to keep Python 3.x compatibility, use six.moves.cStringIO to
replace StringIO

Change-Id: Iff3ecf55573dde287f5eeabfa7c15ef267fafb0c
Closes-Bug: #1280964

xme1226/sahara,matips/iosr-2015,zhangjunli177/sahara,openstack/sahara,redhat-openstack/sahara,zhangjunli177/sahara,tellesnobrega/storm_plugin,keedio/sahara,zhangjunli177/sahara,openstack/sahara,crobby/sahara,citrix-openstack-build/sahara,redhat-openstack/sahara,keedio/sahara,esikachev/scenario,mapr/sahara,tellesnobrega/storm_plugin,bigfootproject/sahara,crobby/sahara,egafford/sahara,esikachev/sahara-backup,zhujzhuo/Sahara,citrix-openstack-build/sahara,esikachev/sahara-backup,matips/iosr-2015,tellesnobrega/sahara,redhat-openstack/sahara,henaras/sahara,tellesnobrega/storm_plugin,xme1226/sahara,mapr/sahara,zhujzhuo/Sahara,henaras/sahara,ekasitk/sahara,esikachev/sahara-backup,bigfootproject/sahara,zhujzhuo/Sahara,ekasitk/sahara,henaras/sahara,xme1226/sahara,crobby/sahara,egafford/sahara,keedio/sahara,bigfootproject/sahara,esikachev/scenario,esikachev/scenario,mapr/sahara,ekasitk/sahara,citrix-openstack-build/sahara,matips/iosr-2015,tellesnobrega/sahara