Cloud-init configuration for virt-install/virt-manager

Cloud-init configuration through virt-install/virt-manager input arguments at VM initial setup. Cloud-init is a package that contains utilities for early initialization of cloud instances. The idea behind my proposal is to use cloud-init for injecting multiple user-data configuration options during the first steps of cloud image installations, making this whole process more automated through specific command line arguments when using virt-install.