Add service deploy via scap
Preliminary rough concept for deploying services via git from scap.
The command would looks something like: deploy <rev> run from
/srv/deployment/restbase/deploy (or other service directory: like
git-deploy now) and would require a .scaprc file at the root of the
repository being deployed with the following information:
[global] git_server: tin.eqiad.wmnet git_repo: restbase/deploy git_deploy_dir: /srv/deployment dsh_targets: restbase-installation [wmflabs] git_server: staging-test-tin.staging.eqiad.wmflabs