Update bess-upf to include fix for uplink SDF parsing

Also, remove bess-upf from SD-Fabric umbrella. Bess-upf is still deployed independently of SD-Fabric.

Change-Id: I3fc0aeebac68ccc0dade132bf764af35cd81d058
diff --git a/bess-upf/values.yaml b/bess-upf/values.yaml
index df8540e..e48d0b3 100644
--- a/bess-upf/values.yaml
+++ b/bess-upf/values.yaml
@@ -4,8 +4,8 @@
 
 images:
   tags:
-    bess: "omecproject/upf-epc-bess:master-9cb736e"
-    pfcpiface: "omecproject/upf-epc-pfcpiface:master-9cb736e"
+    bess: "omecproject/upf-epc-bess:master-9a4d86c"
+    pfcpiface: "omecproject/upf-epc-pfcpiface:master-9a4d86c"
     tools: registry.aetherproject.org/tools/busybox:stable
   pullPolicy: IfNotPresent
   # Secrets must be manually created in the namespace.