Add install-devstack role

This adds a role that installs OpenStack via devstack for end-users.
This lets any job for a project which uses OpenStack as a client
install an OpenStack for testing.

Change-Id: Ic561c7c67b563e3cee7acbcbddc4ae463a695e97

doc/source/cloud-roles.rst

@@ -0,0 +1,4 @@
+Cloud Computing Roles
+=====================
+
+.. zuul:autorole:: install-devstack

doc/source/roles.rst

@@ -8,6 +8,7 @@ Roles
    log-roles
    afs-roles
    container-roles
+   cloud-roles
    deprecated-roles
    galaxy-roles
    js-roles

roles/install-devstack/README.rst

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+Install OpenStack using devstack.
+
+There are currently no configuration options available.  This role
+uses the devstack default settings, except that it does not install
+horizon, tempest, cinder, or swift, and it supplies a restricted
+network configuration designed to work in the maximum number of
+environments.
+
+.. warning:: Do not use this role for testing changes to OpenStack or
+             OpenStack related projects.  Use the ``devstack`` job
+             defined in the https://opendev.org/openstack/devstack
+             project instead.

roles/install-devstack/tasks/main.yaml

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+- name: Set ownership of /opt
+  become: true
+  file:
+    path: /opt
+    state: directory
+    owner: "{{ ansible_user }}"
+    group: "{{ ansible_user }}"
+- name: Clone devstack
+  git:
+    repo: https://opendev.org/openstack/devstack
+    dest: /opt/devstack
+    version: master
+- name: Write local.conf
+  template:
+    dest: /opt/devstack/local.conf
+    src: local.conf.j2
+- name: Run devstack
+  command: ./stack.sh
+  args:
+    chdir: /opt/devstack

roles/install-devstack/templates/local.conf.j2

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+[[local|localrc]]
+disable_service horizon
+disable_service tempest
+disable_service cinder
+disable_service swift
+ADMIN_PASSWORD=secret
+DATABASE_PASSWORD=$ADMIN_PASSWORD
+RABBIT_PASSWORD=$ADMIN_PASSWORD
+SERVICE_PASSWORD=$ADMIN_PASSWORD
+NETWORK_GATEWAY=10.1.0.1
+FIXED_RANGE=10.1.0.0/20
+IPV4_ADDRS_SAFE_TO_USE=10.1.0.0/20
+FLOATING_RANGE=172.24.5.0/24
+PUBLIC_NETWORK_GATEWAY=172.24.5.1
+LIBVIRT_TYPE=qemu