Remove unmaintained contrib: kvm-setup

contrib/kvm-setup/README.md

contrib/kvm-setup/group_vars/all

contrib/kvm-setup/kvm-setup.yml

contrib/kvm-setup/roles/kvm-setup/tasks/main.yml

contrib/kvm-setup/roles/kvm-setup/tasks/sysctl.yml

contrib/kvm-setup/roles/kvm-setup/tasks/user.yml