Add hours parameter to CHO graph job

Change-Id: Ia9b19731a2ae2d9794c4b4c0d309e9fce75373e9
diff --git a/jjb/OnosSystemTest/onos-test-pipeline.yaml b/jjb/OnosSystemTest/onos-test-pipeline.yaml
index f52550e..22d4eab 100644
--- a/jjb/OnosSystemTest/onos-test-pipeline.yaml
+++ b/jjb/OnosSystemTest/onos-test-pipeline.yaml
@@ -374,6 +374,13 @@
                    master
          description: "Branch of the onos"
 
+      - choice:
+         name: hours
+         choices:
+           - '168'
+           - '72'
+         description: "Hours of data to display."
+
       - lf-infra-parameters:
          project: 'OnosSystemTest'
          branch: 'master'