Select mirror when diffing JJB XML files.

* .../jenkins_job_builder/config/job-builder.yaml:
* .../jenkins_job_builder/config/openstack-ci-puppet.yaml:
Run select-mirror.sh before running the compare scripts. This ensures
that dependencies not in the OpenStack mirror can be downloaded. Without
it pip may be configured to only use the OpenStack mirror.

Change-Id: Ie1ce67deb78e4bdfe20884bb6bda0fbb57db2f0e

modules/openstack_project/files/jenkins_job_builder/config/job-builder.yaml

@@ -24,7 +24,9 @@
 
     builders:
       - gerrit-git-prep
-      - shell: "./tools/run-compare-xml.sh"
+      - shell: |
+          source /usr/local/jenkins/slave_scripts/select-mirror.sh openstack-infra jenkins-job-builder
+          ./tools/run-compare-xml.sh
 
     publishers:
       - console-log

modules/openstack_project/files/jenkins_job_builder/config/openstack-ci-puppet.yaml

@@ -16,7 +16,9 @@
 
     builders:
       - gerrit-git-prep
-      - shell: "./tools/run-layout.sh openstack-infra config"
+      - shell: |
+          source /usr/local/jenkins/slave_scripts/select-mirror.sh openstack-infra config
+          ./tools/run-layout.sh openstack-infra config
 
     publishers:
       - console-log