Add content to enable disk image building using Image Factory
and an updated Anaconda
add require in-tree packages for grub2 and lvm

upstream rpm-ostree now supports using grub2 as the bootloader
when the rpm-ostree is installed using anaconda.  It also supports
installing to disk layouts that use LVM.

add the required packages in the base of the install composed tree
to support both features
Merge pull request #4 from imcleod/feature/anaconda-image-build

Feature/anaconda image build