[OOM] Upgrade and clean up OOM jobs

Change-Id: I8c6a22f39add57a5b30ad711ac296825986feb20
Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Issue-ID: CIMAN-424
diff --git a/jjb/oom/oom-main-linter.yaml b/jjb/oom/oom-main-linter.yaml
index b6653d4..0f49ead 100644
--- a/jjb/oom/oom-main-linter.yaml
+++ b/jjb/oom/oom-main-linter.yaml
@@ -30,7 +30,7 @@
     stream:
       - "master":
           branch: "master"
-      - "istanbul":
-          branch: "istanbul"
+      - "kohn":
+          branch: "kohn"
       - "jakarta":
           branch: "jakarta"