Add bmo_release_branch var ir JJBs for enabling CI in BMO branches

Change-Id: I7e4587b50b68f3d045d04e95a93df30e9bd99ffd
diff --git a/jjb/metal3/job_integration_tests.yml b/jjb/metal3/job_integration_tests.yml
index c72d810..15dae13 100644
--- a/jjb/metal3/job_integration_tests.yml
+++ b/jjb/metal3/job_integration_tests.yml
@@ -58,6 +58,10 @@
         default: '{capm3_release_branch}'
         description: 'The target branch of CAPM3 to be used for this test'
     - string:
+        name: bmo_release_branch
+        default: '{bmo_release_branch}'
+        description: 'The target branch of BMO to be used for this test'
+    - string:
         name: IMAGE_OS
         default: '{image_os}'
         description: 'Distribution to use for the target host as well as source and target cluster. Can be ubuntu or centos'