Store triggered build environment variables

Save TRIGGERED_BUILD_NUMBER and, if blocking, TRIGGERED_BUILD_RESULT to
the build environment. Prior to this change, it was necessary to parse
the log file, which was very hacky and only possible on the master. This
can be used by later build steps and downstream jobs.

src/main/java/org/jenkinsci/plugins/ParameterizedRemoteTrigger/RemoteBuildConfiguration.java

@@ -535,6 +535,7 @@ public boolean perform(AbstractBuild build, Launcher launcher, BuildListener lis
         JSONObject queryResponseObject = sendHTTPCall(triggerUrlString, "POST", build, listener);
         int nextBuildNumber = queryResponseObject.getInt("nextBuildNumber");
         listener.getLogger().println("This job is build #[" + Integer.toString(nextBuildNumber) + "] on the remote server.");
+        build.getEnvironment(listener).put("TRIGGERED_BUILD_NUMBER", Integer.toString(nextBuildNumber));
 
         //Have to form the string ourselves, as we might not get a response from non-parameterized builds
         String jobURL = remoteServerURL + "/job/" + this.encodeValue(job) + "/";
@@ -594,6 +595,7 @@ public boolean perform(AbstractBuild build, Launcher launcher, BuildListener lis
                 }
             }
             listener.getLogger().println("Remote build finished with status " + buildStatusStr + ".");
+            build.getEnvironment(listener).put("TRIGGERED_BUILD_RESULT", Integer.toString(nextBuildNumber));
 
             // If build did not finish with 'success' then fail build step.
             if (!buildStatusStr.equals("SUCCESS")) {