~ltrager/maas-images/add_ib

support adding additional repos and packages via environment.

This adds reading of the following environment variables:
 M2E_ADD_REPOS: repos to add to all images before other operations.
 M2E_ADD_PACKAGES: packages to add to all images

This was useful when trying to build images with a new 
cloud-initramfs-tools package that had rooturl support.
Filename Latest Rev Last Changed Committer Comment Size
..
centos6 225.1.1 8 years ago Lee Trager Add import subcommnad for CentOS The import comma Diff
centos7 225.1.1 8 years ago Lee Trager Add import subcommnad for CentOS The import comma Diff