Add ONAP Heat environment files for Centos7

ONAP Offline deployments need Centos7 1901 so this change adds
new heat environment files to ensure the instances can be created
using Centos7.

Please note that City does not have Centos7 1901 so additional steps
might be required to ensure distro is upgraded to 1901 before it can
be used.

Change-Id: I5eec5e8a1bd6e06c0edde05e5f7c7055bffbba9a
4 files changed
tree: b0416bb8f7f803d784bee153f2f4565065a99225
  1. scenarios/
  2. .gitignore
  3. .gitreview