jenkins: Fix Merge requests with forked repositories.

This updates the jenkins configuration to match the recommendations from
https://github.com/jenkinsci/gitlab-plugin

.jenkins.groovy

@@ -55,26 +55,29 @@ def build(nodeName, archive = false, archive_cab = false, analyze = true, test_a
         def URL = ''
         def REFSPEC = env['gitlabBranch']
         try {
-            URL = env['gitlabSourceRepoHttpUrl']
+            URL = env['gitlabTargetRepoHttpUrl']
         }
         catch (exc)
         {
-            URL = 'http://gitlab.raptorengineering.com/kestrel-collaboration/firmware.git'
+            try {
+                URL = env['gitlabSourceRepoHttpUrl']
+            }
+            catch (exc2)
+            {
+                URL = 'http://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-firmware/bare-metal-firmware.git'
+            }
         }
         def HASH = ''
         try {
-            HASH = env['gitlabMergeRequestLastCommit']
+            // Merge request
+            HASH = 'merge-requests/' + env['gitlabMergeRequestIid']
+            REFSPEC = '+refs/heads/*:refs/remotes/origin/* +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*'
         }
         catch (exc)
         {
-            try {
-                HASH = GITHUB_PR_HEAD_SHA
-                REFSPEC = '+refs/pull/*:refs/remotes/origin/pr/*'
-            }
-            catch (exc2)
-            {
-                HASH = '**'
-            }
+            // Push to repo
+            HASH = 'origin/' + env['gitlabSourceBranch}']
+            REFSPEC = env['gitlabBranch']
         }
 
         stage('checkout')
@@ -86,7 +89,7 @@ def build(nodeName, archive = false, archive_cab = false, analyze = true, test_a
                         refspec: REFSPEC,
                         url: URL
                     ]],
-                    browser: [$class: 'GitLab', repoUrl: 'http://gitlab.raptorengineering.com/kestrel-collaboration/firmware'],
+                    browser: [$class: 'GitLab', repoUrl: 'http://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-firmware/bare-metal-firmware'],
                     doGenerateSubmoduleConfigurations: false,
                     extensions: [
                         [$class: 'SubmoduleOption',
@@ -95,7 +98,7 @@ def build(nodeName, archive = false, archive_cab = false, analyze = true, test_a
                             recursiveSubmodules: false,
                             reference: '',
                             trackingSubmodules: false
-                        ]
+                        ],
                     ],
                     submoduleCfg: []
                 ])