Minor - changed name of argument in mirgation tests
Minor - changed name of argument in mirgation tests

Provided argument is 'data', but not 'date'.

Change-Id: I43fbda383112b4883b6237fa2308181d03b7f87f

redhat-openstack/sahara,crobby/sahara,zhangjunli177/sahara,ekasitk/sahara,matips/iosr-2015,zhujzhuo/Sahara,openstack/sahara,zhangjunli177/sahara,zhujzhuo/Sahara,crobby/sahara,bigfootproject/sahara,zhujzhuo/Sahara,henaras/sahara,openstack/sahara,egafford/sahara,esikachev/sahara-backup,ekasitk/sahara,bigfootproject/sahara,matips/iosr-2015,bigfootproject/sahara,matips/iosr-2015,crobby/sahara,redhat-openstack/sahara,ekasitk/sahara,zhangjunli177/sahara,tellesnobrega/sahara,esikachev/sahara-backup,henaras/sahara,redhat-openstack/sahara,egafford/sahara,tellesnobrega/sahara,esikachev/sahara-backup,henaras/sahara