Fix #2341: Bosh fails to properly record runtime config tags as deployed

We were properly applying tags from runtime configs, but not properly recording
that the runtime config was used as part of the deployment. This meant the next
deploy would detect the tags as a change, and update the tags again.

[#180420267]

Author: Joseph Palermo

src/bosh-director/lib/bosh/director/deployment_plan/planner_factory.rb

@@ -103,6 +103,8 @@ def parse_from_manifest(manifest, cloud_config_consolidator, runtime_configs, op
             parsed_runtime_config = RuntimeConfig::RuntimeManifestParser.new(@logger, variables_spec_parser).parse(variables_interpolator.interpolate_runtime_manifest(runtime_config.raw_manifest, name))
             runtime_config_applies = false
 
+            runtime_config_applies = true if parsed_runtime_config.addons.empty?
+
             parsed_runtime_config.get_applicable_releases(deployment).each do |release|
               runtime_config_applies = true
               release.add_to_deployment(deployment)

src/bosh-director/spec/unit/deployment_plan/planner_factory_spec.rb

@@ -328,6 +328,15 @@ module DeploymentPlan
           end
 
           context 'runtime config' do
+            context 'when the runtime config has tags' do
+              let(:runtime_config_hash) { { 'releases' => [], 'tags' => { 'tag_name' => 'tag_value' } } }
+
+              it 'includes the runtime config' do
+                expect(planner.runtime_configs.length).to equal(1)
+                expect(planner.runtime_configs.first.content).to include('tag_name')
+              end
+            end
+
             context "when the version of a release is 'latest'" do
               let(:runtime_config_hash) { Bosh::Spec::Deployments.simple_runtime_config(release = 'bosh-release', version = 'latest') }