centos7

Use Centos 7 cloud images as the baseline for built disk images.

For further details see the redhat-common README.

DIB_DISTRIBUTION_MIRROR:

Required:No Default:None Description:To use a CentOS Yum mirror, set this variable to the mirror URL before running bin/disk-image-create. This URL should point to the directory containing the 5/6/7 directories. Example:DIB_DISTRIBUTION_MIRROR=http://amirror.com/centos