fedora image build fails on installing package grub2

[Ivan Berezovskiy]

The build of fedora images fails in step finalise.d/51-bootloader when we try to install grub2:

rpm -i /tmp/grub/grub2-2.00-25.fc20.x86_64.rpm
 package grub2-1:2.00-25.fc20.x86_64 is already installed

The problem is in pre-install.d/15-fedora-remove-grub. We remove grub2 package but then we use 'install-packages -d grub2' option -d doesn't work. If you take a look on yum/bin/install-packages you'll see that we set variable EXTRA_ARGS="--downloadonly" then option -d is specified, but we don't use this variable when we execute command 'yum -y install $(map-packages $WHITELIST)'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/77570

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/77184
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=30d1668c0318fd5f6147d3df6d7ecc883926a104
Submitter: Jenkins
Branch: master

commit 30d1668c0318fd5f6147d3df6d7ecc883926a104
Author: James Slagle <email address hidden>
Date: Fri Feb 28 09:37:07 2014 -0500

    Add $EXTRA_ARGS back to yum call

    This got removed accidentally in a recent consolidation of
    install-packages. Adding it back so that -d support works again.

    Closes-bug: #1287142

    Change-Id: If17e613bc9bc0f808517edfa1506858d3b9dce54