Small fix in savanna for image check
Small fix in savanna for image check

Change-Id: Iec5f6013a03d2a2cac5474e8fa1337ef8942453a

eayunstack/fuel-ostf,mcloudv/fuel-ostf,stackforge/fuel-ostf,mcloudv/fuel-ostf,stackforge/fuel-ostf,eayunstack/fuel-ostf