Add support for Display Upstream Changes Plugin

Supports publisher for displaying SCM changes for upstream jobs
https://wiki.jenkins-ci.org/display/JENKINS/Display+Upstream+Changes+Plugin

Change-Id: I7720220ce05e2882e407ea75ca0c689cbd8c9a0b

jenkins_jobs/modules/publishers.py

@@ -4197,6 +4197,23 @@ def scoverage(parser, xml_parent, data):
         data.get('report-file', ''))
 
 
+def display_upstream_changes(parser, xml_parent, data):
+    """yaml: display-upstream-changes
+    Display SCM changes of upstream jobs. Requires the Jenkins
+    :jenkins-wiki:`Display Upstream Changes Plugin
+    <Display+Upstream+Changes+Plugin>`.
+
+    Example:
+
+    .. literalinclude:: \
+    /../../tests/publishers/fixtures/display-upstream-changes.yaml
+    """
+    XML.SubElement(
+        xml_parent,
+        'jenkins.plugins.displayupstreamchanges.'
+        'DisplayUpstreamChangesRecorder')
+
+
 class Publishers(jenkins_jobs.modules.base.Base):
     sequence = 70
 

setup.cfg

@@ -139,6 +139,7 @@ jenkins_jobs.publishers =
     coverage=jenkins_jobs.modules.publishers:coverage
     cppcheck=jenkins_jobs.modules.publishers:cppcheck
     description-setter=jenkins_jobs.modules.publishers:description_setter
+    display-upstream-changes=jenkins_jobs.modules.publishers:display_upstream_changes
     downstream-ext=jenkins_jobs.modules.publishers:downstream_ext
     doxygen=jenkins_jobs.modules.publishers:doxygen
     dry=jenkins_jobs.modules.publishers:dry

tests/publishers/fixtures/display-upstream-changes.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<project>
+    <publishers>
+        <jenkins.plugins.displayupstreamchanges.DisplayUpstreamChangesRecorder/>
+    </publishers>
+</project>

tests/publishers/fixtures/display-upstream-changes.yaml

@@ -0,0 +1,2 @@
+publishers:
+  - display-upstream-changes