Set reference repo under clone options

When we have cloneOptions in the generated with options like
tags and reference filled outside of cloneOptions,
The reference is not filled in the job configuration and this
option will not work as expected. reference should
alwasy be listed inside CloneOptions.

Change-Id: I519d3c42f1b32ab27243b0f5c592e3d41e3230bb
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>

jenkins_jobs/modules/scm.py

@@ -447,6 +447,7 @@ def git_extensions(xml_parent, data):
         "timeout",
         "do-not-fetch-tags",
         "honor-refspec",
+        "reference-repo",
     )
     if any(key in data for key in clone_options):
         ext_name = impl_prefix + 'CloneOption'
@@ -471,6 +472,8 @@ def git_extensions(xml_parent, data):
         if 'honor-refspec' in data:
             XML.SubElement(ext, 'honorRefspec').text = str(
                 data.get('honor-refspec', False)).lower()
+        if 'reference-repo' in data:
+            XML.SubElement(ext, 'reference').text = str(data['reference-repo'])
     if not trait and 'sparse-checkout' in data:
         ext_name = impl_prefix + 'SparseCheckoutPaths'
         ext = XML.SubElement(xml_parent, ext_name)

tests/scm/fixtures/git-extensions-reference-repo.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<project>
+  <scm class="hudson.plugins.git.GitSCM">
+    <configVersion>2</configVersion>
+    <userRemoteConfigs>
+      <hudson.plugins.git.UserRemoteConfig>
+        <name>origin</name>
+        <refspec>+refs/heads/*:refs/remotes/origin/*</refspec>
+        <url>https://example.com/project.git</url>
+      </hudson.plugins.git.UserRemoteConfig>
+    </userRemoteConfigs>
+    <branches>
+      <hudson.plugins.git.BranchSpec>
+        <name>**</name>
+      </hudson.plugins.git.BranchSpec>
+    </branches>
+    <disableSubmodules>false</disableSubmodules>
+    <recursiveSubmodules>false</recursiveSubmodules>
+    <doGenerateSubmoduleConfigurations>false</doGenerateSubmoduleConfigurations>
+    <remotePoll>false</remotePoll>
+    <gitTool>Default</gitTool>
+    <submoduleCfg class="list"/>
+    <reference>/path/to/reference/repo.git</reference>
+    <gitConfigName/>
+    <gitConfigEmail/>
+    <extensions>
+      <hudson.plugins.git.extensions.impl.CloneOption>
+        <shallow>false</shallow>
+        <depth>1</depth>
+        <reference>/path/to/reference/repo.git</reference>
+      </hudson.plugins.git.extensions.impl.CloneOption>
+      <hudson.plugins.git.extensions.impl.WipeWorkspace/>
+    </extensions>
+  </scm>
+</project>

tests/scm/fixtures/git-extensions-reference-repo.yaml

@@ -0,0 +1,4 @@
+scm:
+  - git:
+      url: https://example.com/project.git
+      reference-repo: /path/to/reference/repo.git