Add Kubernetes canary template

Replaces https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/68 by putting canary deploy into new template so users choose whether they want canaries or not. Also updated to use SLUG instead of NAME.

autodeploy/Kubernetes-with-canary.gitlab-ci.yml

@@ -30,7 +30,6 @@ canary:
     name: production
     url: http://$CI_PROJECT_NAME.$KUBE_DOMAIN
   when: manual
-  allow_failure: false
   only:
     - master
@@ -42,7 +41,6 @@ production:
     name: production
     url: http://$CI_PROJECT_NAME.$KUBE_DOMAIN
   when: manual
-  allow_failure: false
   only:
     - master