adjust the included-regions for ipa builds

The changes present in this commit restrict the scope of the github
trigger of the ipa jobs in order to only trigger the jobs when
explicitly specified source code regions are modified.

Change-Id: I2d5cdc7ff74e87afebfd98d4e1aa76fb0db75098
diff --git a/jjb/metal3/job_ipa_image_building_test.yml b/jjb/metal3/job_ipa_image_building_test.yml
index 5a4f76a..1dd9d52 100644
--- a/jjb/metal3/job_ipa_image_building_test.yml
+++ b/jjb/metal3/job_ipa_image_building_test.yml
@@ -149,5 +149,10 @@
           wipe-workspace: True
           honor-refspec: True
           shallow-clone: False
+          included-regions:
+                - "ci/scripts/image_scripts/ipa_builder_elements/.*"
+                - "ci/scripts/image_scripts/build_ipa.sh"
+                - "ci/scripts/image_scripts/run_build_ironic.sh"
+                - "ci/scripts/image_scripts/start_centos_ipa_ironic_build.sh"
       script-path: "ci/jobs/openstack_ipa_and_ironic_image_building.pipeline"
       lightweight-checkout: False