* Adds support for provisioning a Multi Node AIO using
CentOS 7.
* Cleans up older MNAIO/Compute/Infra image configs
* Increases LB/Logging/Swift VM ram to allow for CentOS rootfs
to load into RAM. (1GB to 2GB)
* Uses systemd-network networking for configuring network/bridges
* Adds keymap to kvm configuration to alleviate keyboard issues in
virt-manager
Change-Id: I54d903e7c1c70882e8b20a9cef4eafb42be46770
c3e04a5106