Merge pull request #2317 from kubernetes-incubator/add_digitalocean_ci

Additional CI platform (digital-ocean)

tests/requirements.txt

@@ -3,3 +3,5 @@ yamllint
 apache-libcloud==2.2.1
 boto==2.9.0
 tox
+dopy
+PyCrypto

tests/templates/inventory-do.j2

+{% for instance in droplets.results %}
+{{instance.droplet.name}} ansible_ssh_host={{instance.droplet.ip_address}}
+{% endfor %}
+
+{% if mode is defined and mode == "separate" %}
+[kube-master]
+{{droplets.results[0].droplet.name}}
+
+[kube-node]
+{{droplets.results[1].droplet.name}}
+
+[etcd]
+{{droplets.results[2].droplet.name}}
+
+[vault]
+{{droplets.results[2].droplet.name}}
+{% elif mode is defined and mode == "ha" %}
+[kube-master]
+{{droplets.results[0].droplet.name}}
+{{droplets.results[1].droplet.name}}
+
+[kube-node]
+{{droplets.results[2].droplet.name}}
+
+[etcd]
+{{droplets.results[1].droplet.name}}
+{{droplets.results[2].droplet.name}}
+
+[vault]
+{{droplets.results[1].droplet.name}}
+{{droplets.results[2].droplet.name}}
+{% else %}
+[kube-master]
+{{droplets.results[0].droplet.name}}
+
+[kube-node]
+{{droplets.results[1].droplet.name}}
+
+[etcd]
+{{droplets.results[0].droplet.name}}
+
+[vault]
+{{droplets.results[0].droplet.name}}
+{% endif %}
+
+[k8s-cluster:children]
+kube-node
+kube-master