Add docker composable service template

This uses a puppet-tripleo profile to configure and start docker
in step1 of the deployment, which is before we attempt to deploy
any containers (see docker/services/README.rst#docker-steps)

This enables existing environments on upgrade to configure things
correctly, without using the docker/firstboot/setup_docker_host.sh
- the firstboot approach may still be needed for atomic, but for
environments where we can run puppet on the host this integrates
more cleanly with our existing architecture I think.

Depends-On: Id8add1e8a0ecaedb7d8a7dc9ba3747c1ac3b8eea
Change-Id: If4ffe21579bcb2770f4e5a96be7960b52927a27b

puppet/services/docker.yaml

@@ -0,0 +1,43 @@
+heat_template_version: ocata
+
+description: >
+  Configures docker on the host
+
+parameters:
+  DockerNamespace:
+    description: namespace
+    default: tripleoupstream
+    type: string
+  DockerNamespaceIsRegistry:
+    type: boolean
+    default: false
+  EndpointMap:
+    default: {}
+    description: Mapping of service endpoint -> protocol. Typically set
+                 via parameter_defaults in the resource registry.
+    type: json
+  ServiceNetMap:
+    default: {}
+    description: Mapping of service_name -> network name. Typically set
+                 via parameter_defaults in the resource registry.  This
+                 mapping overrides those in ServiceNetMapDefaults.
+    type: json
+  DefaultPasswords:
+    default: {}
+    type: json
+
+outputs:
+  role_data:
+    description: Role data for the docker service
+    value:
+      service_name: docker
+      config_settings:
+        tripleo::profile::base::docker::docker_namespace: {get_param: DockerNamespace}
+        tripleo::profile::base::docker::insecure_registry: {get_param: DockerNamespaceIsRegistry}
+      step_config: |
+        include ::tripleo::profile::base::docker
+      upgrade_tasks:
+        - name: Install docker packages on upgrade if missing
+          tags: step3
+          yum: name=docker state=latest
+