Add support for coordination parameters

Recent Tacker uses the tooz library to synchronize vnf action tasks[1].
This change introduces the new tacker::coordination class which manages
coordination parameters and backend packages using oslo::coordination
resource type.

[1] cff8c756822da5a8a7b92eec536db4532d31c408

Depends-on: https://review.opendev.org/791628
Change-Id: I3cb36be7fe6b43133f09ed6edce3f258786d7dc2

manifests/coordination.pp

@@ -0,0 +1,20 @@
+# == Class: tacker::coordination
+#
+# Setup and configure Tacker coordination settings.
+#
+# === Parameters
+#
+# [*backend_url*]
+#   (Optional) Coordination backend URL.
+#   Defaults to $::os_service_default
+#
+class tacker::coordination (
+  $backend_url = $::os_service_default,
+) {
+
+  include tacker::deps
+
+  oslo::coordination{ 'tacker_config':
+    backend_url => $backend_url
+  }
+}

releasenotes/notes/coordination-62df61b16108ae0b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``tacker::coordination`` class has been added.

spec/classes/tacker_coordination_spec.rb

@@ -0,0 +1,39 @@
+require 'spec_helper'
+
+describe 'tacker::coordination' do
+  shared_examples 'tacker::coordination' do
+    context 'with default parameters' do
+      it {
+        is_expected.to contain_oslo__coordination('tacker_config').with(
+          :backend_url => '<SERVICE DEFAULT>'
+        )
+      }
+    end
+
+    context 'with specified parameters' do
+      let :params do
+        {
+          :backend_url => 'etcd3+http://127.0.0.1:2379',
+        }
+      end
+
+      it {
+        is_expected.to contain_oslo__coordination('tacker_config').with(
+          :backend_url => 'etcd3+http://127.0.0.1:2379'
+        )
+      }
+    end
+  end
+
+  on_supported_os({
+    :supported_os => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge(OSDefaults.get_facts())
+      end
+
+      it_behaves_like 'tacker::coordination'
+    end
+  end
+end