Keep Ubuntu repository indices for Fuel ISO.
Keep Ubuntu repository indices for Fuel ISO.

It is useful for further manipulation with Ubuntu
repository placed on the Fuel master node.

Implements: https://blueprints.launchpad.net/fuel/+spec/testing-packages-in-enviroment

Change-Id: I8f0e1fc11a3ee58c46fbd9f44e00da7bb2f91c0f

eayunstack/fuel-main,SmartInfrastructures/fuel-main-dev,stackforge/fuel-main,AnselZhangGit/fuel-main,dancn/fuel-main-dev,AnselZhangGit/fuel-main,Fiware/ops.Fuel-main-dev,ddepaoli3/fuel-main-dev,ddepaoli3/fuel-main-dev,teselkin/fuel-main,stackforge/fuel-main,eayunstack/fuel-main,zhaochao/fuel-main,huntxu/fuel-main,eayunstack/fuel-main,zhaochao/fuel-main,zhaochao/fuel-main,SergK/fuel-main,ddepaoli3/fuel-main-dev,AnselZhangGit/fuel-main,SergK/fuel-main,Fiware/ops.Fuel-main-dev,SmartInfrastructures/fuel-main-dev,teselkin/fuel-main,huntxu/fuel-main,teselkin/fuel-main,dancn/fuel-main-dev,huntxu/fuel-main,zhaochao/fuel-main,Fiware/ops.Fuel-main-dev,Fiware/ops.Fuel-main-dev,SmartInfrastructures/fuel-main-dev,AnselZhangGit/fuel-main,SergK/fuel-main,zhaochao/fuel-main,teselkin/fuel-main,dancn/fuel-main-dev,dancn/fuel-main-dev,stackforge/fuel-main,SmartInfrastructures/fuel-main-dev,ddepaoli3/fuel-main-dev