QuickBite: Avoid Fedora qcow download during Devstack installation

While installing the latest devstack, I found that it downloads Fedora's qcow image as a part of heat installation : https://download.fedoraproject.org/pub/alt/openstack/20/x86_64/Fedora-x86_64-20-20140618-sda.qcow2. Its a 200MB file and is definitely not needed for Neutron related development. I see that there is an option in local.conf which will make it stick to the default Cirros. You can do it by setting the below config in local.conf:


This downloads the latest 0.3.3 series image of Cirros. At a later point, you can visit http://download.cirros-cloud.net/ and download the latest version as shown there.


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