enable dev tools integration tests

This commit:
  - re-enables integration tests for the metal3-dev-tools
    repository

Change-Id: Id5d6cd158e454cd95b9bb06b30747b2086228c61
diff --git a/jjb/metal3/projects.yml b/jjb/metal3/projects.yml
index ed1ad10..8b1d819 100644
--- a/jjb/metal3/projects.yml
+++ b/jjb/metal3/projects.yml
@@ -40,6 +40,10 @@
     - update_nordix_repos
     - main_fullstack_building
     - fullstack_building_test
+    - metal3_dev_tools_integration_test:
+        image_os:
+          - ubuntu
+          - centos
     - artifact_cleanup
     repo:
       org: "Nordix"