Add bootstrap image to upgrade tarball
Add bootstrap image to upgrade tarball

In order to make possible update bootstrap image on Fuel node, we need
to ship it within our tarball.

Implements blueprint upgrade-to-5-1
Partial-Bug: #1336689
Change-Id: I45e9643e999f9b748703b6358519980298d5abc3

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