publishers: add "threshold" support to join-trigger

The joinTrigger plugin now accepts a resultThreshold field instead
of the evenIfDownstreamUnstable boolean.  Add support for a "threshold"
yaml field to manage this value.

Change-Id: I60ba999b963709a76854a4d50387d2b1eefae05f
Signed-off-by: David Aguilar <davvid@gmail.com>

jenkins_jobs/modules/publishers.py

@@ -3496,6 +3496,8 @@ def join_trigger(registry, xml_parent, data):
     :arg list projects: list of projects to trigger
     :arg list publishers: list of triggers from publishers module that
         defines projects that need to be triggered
+    :arg str threshold: result threshold to trigger jobs (optional).
+        Valid values are "success", "unstable", "failure", and "aborted".
     :arg bool even-if-unstable: if true jobs will trigger even if some
         downstream jobs are marked as unstable (default false) (DEPRECATED)
 
@@ -3519,6 +3521,10 @@ def join_trigger(registry, xml_parent, data):
     if unstable:
         XML.SubElement(jointrigger, "evenIfDownstreamUnstable").text = unstable
 
+    threshold = data.get("threshold", "")
+    if threshold:
+        helpers.trigger_threshold(jointrigger, "resultThreshold", threshold)
+
 
 def jabber(registry, xml_parent, data):
     """yaml: jabber

tests/publishers/fixtures/join-trigger002.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<project>
+  <publishers>
+    <hudson.tasks.BuildTrigger>
+      <childProjects>project-1,project-2</childProjects>
+      <threshold>
+        <name>FAILURE</name>
+        <ordinal>2</ordinal>
+        <color>RED</color>
+      </threshold>
+    </hudson.tasks.BuildTrigger>
+    <join.JoinTrigger>
+      <joinProjects>cleanup</joinProjects>
+      <joinPublishers/>
+      <resultThreshold>
+        <name>FAILURE</name>
+        <ordinal>2</ordinal>
+        <color>RED</color>
+      </resultThreshold>
+    </join.JoinTrigger>
+  </publishers>
+</project>

tests/publishers/fixtures/join-trigger002.yaml

@@ -0,0 +1,8 @@
+publishers:
+  - trigger:
+      project: project-1,project-2
+      threshold: failure
+  - join-trigger:
+      projects:
+        - cleanup
+      threshold: failure