Add CI job to keep e2e upgrade test VM for a day.

Change-Id: I366a78d40a87ae4c491fdd1d8a32914f94a043c5
diff --git a/jjb/metal3/projects.yml b/jjb/metal3/projects.yml
index b01b428..34ffacd 100644
--- a/jjb/metal3/projects.yml
+++ b/jjb/metal3/projects.yml
@@ -305,6 +305,9 @@
       - capm3_e2e_tests_parallel:
       - capm3_e2e_tests:
       - keep_capm3_e2e_tests:
+      - keep_capm3_e2e_upgrade_tests:
+          exclude:
+            - image_os: centos
 
 - project:
     name: "capm3-main-tests"