Add role to install kubernetes

Optionally, and by default, installs a Minikube cluster that runs
locally.

Change-Id: Ie6d0b73e6b3bdb77eee133a5f663133fd037aba0

roles/install-kubernetes/README.rst

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+An ansible role to install kubernetes.
+
+**Role Variables**
+
+.. zuul:rolevar:: install_kubernetes_with_cluster
+   :default: True
+
+   If true, installs a Minikube cluster.

roles/install-kubernetes/defaults/main.yaml

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+install_kubernetes_with_cluster: True

roles/install-kubernetes/tasks/main.yaml

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+- name: Install apt key
+  become: yes
+  apt_key:
+    url: "https://packages.cloud.google.com/apt/doc/apt-key.gpg"
+    state: present
+
+- name: Add kubernetes repo
+  become: yes
+  apt_repository:
+    repo: deb http://apt.kubernetes.io/ kubernetes-xenial main
+    state: present
+
+- name: Install kubernetes packages
+  become: yes
+  apt:
+    name: kubectl
+    update_cache: yes
+
+- name: Run cluster tasks
+  include_tasks: minikube.yaml
+  when: install_kubernetes_with_cluster

roles/install-kubernetes/tasks/minikube.yaml

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+- name: Check for Minikube install
+  stat:
+    path: /tmp/minikube
+  register: stat_result
+
+- name: Download Minikube
+  get_url:
+    url: https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
+    dest: /tmp/minikube
+    mode: 0755
+  when: stat_result.stat.exists == False
+
+- name: Run install-docker role
+  include_role:
+    name: install-docker
+
+- name: Create .kube directory
+  file:
+    path: "{{ ansible_user_dir }}/.kube"
+    state: directory
+    mode: 0755
+
+- name: Create .kube/config file
+  file:
+    path: "{{ ansible_user_dir }}/.kube/config"
+    state: touch
+    mode: 0644
+
+- name: Create .minikube directory
+  file:
+    path: "{{ ansible_user_dir }}/.minikube"
+    state: directory
+    mode: 0755
+
+- name: Start Minikube
+  become: yes
+  command: /tmp/minikube --vm-driver=none start
+  environment:
+    MINIKUBE_WANTUPDATENOTIFICATION: false
+    MINIKUBE_WANTREPORTERRORPROMPT: false
+    MINIKUBE_WANTNONEDRIVERWARNING: false
+    MINIKUBE_WANTKUBECTLDOWNLOADMSG: false
+    CHANGE_MINIKUBE_NONE_USER: true
+    MINIKUBE_HOME: "{{ ansible_user_dir }}"
+    KUBECONFIG: "{{ ansible_user_dir }}/.kube/config"
+
+- name: Get cluster info
+  command: kubectl cluster-info