delivery-pipeline: support task description template

as documented in

    https://github.com/Diabol/delivery-pipeline-plugin/pull/138

Change-Id: Ic6d7e54ea55c235deeb80240bb5c10e84bcff30d

jenkins_jobs/modules/properties.py

@@ -579,6 +579,8 @@ def delivery_pipeline(parser, xml_parent, data):
     Requires the Jenkins :jenkins-wiki:`Delivery Pipeline Plugin
     <Delivery+Pipeline+Plugin>`.
 
+    :arg str description: task description template for this job
+        (default: '')
     :arg str stage: Name of the stage for this job (default: '')
     :arg str task: Name of the task for this job (default: '')
 
@@ -593,6 +595,8 @@ def delivery_pipeline(parser, xml_parent, data):
                               'PipelineProperty')
     XML.SubElement(pipeline, 'stageName').text = data.get('stage', '')
     XML.SubElement(pipeline, 'taskName').text = data.get('task', '')
+    XML.SubElement(pipeline, 'descriptionTemplate').text = str(
+        data.get('description', ''))
 
 
 def zeromq_event(parser, xml_parent, data):

tests/properties/fixtures/delivery-pipeline1.xml

@@ -4,6 +4,7 @@
     <se.diabol.jenkins.pipeline.PipelineProperty>
       <stageName>Stage</stageName>
       <taskName>Task</taskName>
+      <descriptionTemplate>Task-Description</descriptionTemplate>
     </se.diabol.jenkins.pipeline.PipelineProperty>
   </properties>
 </project>

tests/properties/fixtures/delivery-pipeline1.yaml

@@ -2,3 +2,4 @@ properties:
   - delivery-pipeline:
       stage: Stage
       task: Task
+      description: Task-Description

tests/properties/fixtures/delivery-pipeline2.xml

@@ -4,6 +4,7 @@
     <se.diabol.jenkins.pipeline.PipelineProperty>
       <stageName/>
       <taskName/>
+      <descriptionTemplate/>
     </se.diabol.jenkins.pipeline.PipelineProperty>
   </properties>
 </project>