Most of our distros support DIB_DISTRIBUTION_MIRROR for setting the
mirror to be used when building. This has a major downside where if
someone would like to create a static configuration for building various
distro images it cannot set DIB_DISTRIBUTION_MIRROR (think of the case
where we want to run our tests).
By adding support for DIB_$DISTRO_DISTRIBUTION_MIRROR this problem is
resolved.
Change-Id: I92964b17ec3e47cf97e3a3091f054b2a205ac768
Instead of manually creating epel.repo files, make use of the epel
element, which will properly install epel-release.
Change-Id: Iea7b389bc1ade716c622fd39d5e7dcf119dcb447
This is the centos element, which builds CentOS 6.
There are a couple of modifications to redhat-common because
the version of tar in el6 doesn't support --xattrs-include.
There is a change to both pkg-map and svc-map to add 'centos'
to the 'redhat' family.
Also explicitly have to install cloud-utils growroot and
dracut growpart for proper fsresize at instance launch.
Also sets the DIB_EXTLINUX variable because there is no grub2
for this distro.
Change-Id: Iffd57bce1484c43c2cffcbdb37b602185216e63a
