COMAC-168,COMAC-171 [omec-dp] Change sriov configs and enable nodePort

- Change sriov configs to help user configure more easily
- Enable nodePort for CP-DP communication when CP and DP are deployed in
  separate clusters, diabled by default

Change-Id: I0e2520d66f2240a2888673d930487dcf112861a0
diff --git a/omec/omec-data-plane/templates/statefulset-spgwu.yaml b/omec/omec-data-plane/templates/statefulset-spgwu.yaml
index 21e8d57..11749e7 100644
--- a/omec/omec-data-plane/templates/statefulset-spgwu.yaml
+++ b/omec/omec-data-plane/templates/statefulset-spgwu.yaml
@@ -26,7 +26,6 @@
   selector:
     matchLabels:
 {{ tuple "spgwu" . | include "omec-data-plane.metadata_labels" | indent 6 }}
-  serviceName: spgwu
   template:
     metadata:
       labels:
@@ -88,7 +87,7 @@
               containerName: spgwu
               resource: limits.memory
               divisor: 1Mi
-        - name: DP_ADDR
+        - name: POD_IP
           valueFrom:
             fieldRef:
               fieldPath: status.podIP