Add a lightweight UC template/role data for deployed-servers

Allows to deploy the minimal UC services capable
to install overcloud on pre-provisioned deployed servers.
Zaqar is configured to be mongo-less.

Follows up the filtered prepare images command changes
https://review.openstack.org/#/q/topic:bug/1710992

Related-bug: #1693448

Change-Id: I26cbeb7ce5fd07ffdc2e22da91777316b7de6294
Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

environments/docker-uc-light.yaml

@@ -0,0 +1,29 @@
+# A lightweight UC for pre-provisioned deployed servers
+resource_registry:
+  OS::TripleO::Services::Docker: ../puppet/services/docker.yaml
+  # Default Neutron ML2 puppet plugin to use when NeutronCorePlugin is set to ML2
+  OS::TripleO::Docker::NeutronMl2PluginBase: ../puppet/services/neutron-plugin-ml2.yaml
+
+  OS::TripleO::Services::ContainersLogrotateCrond: ../docker/services/logrotate-crond.yaml
+  OS::TripleO::Services::HeatApi: ../docker/services/heat-api.yaml
+  OS::TripleO::Services::HeatApiCfn: ../docker/services/heat-api-cfn.yaml
+  OS::TripleO::Services::HeatEngine: ../docker/services/heat-engine.yaml
+  OS::TripleO::Services::Keystone: ../docker/services/keystone.yaml
+  OS::TripleO::Services::Memcached: ../docker/services/memcached.yaml
+  OS::TripleO::Services::MistralApi: ../docker/services/mistral-api.yaml
+  OS::TripleO::Services::MistralEngine: ../docker/services/mistral-engine.yaml
+  OS::TripleO::Services::MistralExecutor: ../docker/services/mistral-executor.yaml
+  OS::TripleO::Services::MySQL: ../docker/services/database/mysql.yaml
+  OS::TripleO::Services::NeutronApi: ../docker/services/neutron-api.yaml
+  OS::TripleO::Services::NeutronCorePlugin: ../docker/services/neutron-plugin-ml2.yaml
+  OS::TripleO::Services::NeutronDhcpAgent: ../docker/services/neutron-dhcp.yaml
+  OS::TripleO::Services::NeutronServer: ../docker/services/neutron-api.yaml
+  OS::TripleO::Services::RabbitMQ: ../docker/services/rabbitmq.yaml
+  OS::TripleO::Services::SwiftProxy: ../docker/services/swift-proxy.yaml
+  OS::TripleO::Services::SwiftRingBuilder: ../docker/services/swift-ringbuilder.yaml
+  OS::TripleO::Services::SwiftStorage: ../docker/services/swift-storage.yaml
+  OS::TripleO::Services::Zaqar: ../docker/services/zaqar.yaml
+
+parameter_defaults:
+  ZaqarMessageStore: 'swift'
+  ZaqarManagementStore: 'sqlalchemy'

roles/UndercloudLight.yaml

@@ -0,0 +1,34 @@
+###############################################################################
+# Role: Undercloud                                                            #
+###############################################################################
+- name: Undercloud
+  description: |
+    EXPERIMENTAL. A role to deploy the  minimal undercloud for pre-provisioned
+    deployed servers via heat using the 'openstack undercloud deploy' command.
+    Should be used with the 'environments/docker-uc-light.yaml' template
+    instead of the 'environments/docker.yaml'.
+  CountDefault: 1
+  disable_constraints: True
+  tags:
+    - primary
+    - controller
+  ServicesDefault:
+    - OS::TripleO::Services::ContainersLogrotateCrond
+    - OS::TripleO::Services::HeatApi
+    - OS::TripleO::Services::HeatApiCfn
+    - OS::TripleO::Services::HeatEngine
+    - OS::TripleO::Services::Keystone
+    - OS::TripleO::Services::Memcached
+    - OS::TripleO::Services::MistralApi
+    - OS::TripleO::Services::MistralEngine
+    - OS::TripleO::Services::MistralExecutor
+    - OS::TripleO::Services::MySQL
+    - OS::TripleO::Services::NeutronApi
+    - OS::TripleO::Services::NeutronCorePlugin
+    - OS::TripleO::Services::NeutronDhcpAgent
+    - OS::TripleO::Services::NeutronServer
+    - OS::TripleO::Services::RabbitMQ
+    - OS::TripleO::Services::SwiftProxy
+    - OS::TripleO::Services::SwiftRingBuilder
+    - OS::TripleO::Services::SwiftStorage
+    - OS::TripleO::Services::Zaqar