[CORD-2729][CORD-2730] Add S1-MME and SPGW flat networks for P4 use-case in epc-service

Change-Id: I93e166b7768a877d99e4f8ef2a64a5ce492db668
diff --git a/xos/synchronizer/vepc_config.yaml b/xos/synchronizer/vepc_config.yaml
index b9d74ac..e257a5d 100644
--- a/xos/synchronizer/vepc_config.yaml
+++ b/xos/synchronizer/vepc_config.yaml
@@ -137,8 +137,8 @@
           - db_network
   - name: mcord_5_p4
     networks:
-      - name: flat_network_s1mme
-        subnet: 118.0.0.0/24
+      - name: flat_network_s1mme_p4
+        subnet: 122.0.0.0/24
         permit_all_slices: True
         template: flat_template
         owner: vmme
@@ -161,7 +161,7 @@
       - name: VMMETenant
         networks:
           - management
-          - flat_network_s1mme
+          - flat_network_s1mme_p4
           - s11_network
           - s6a_network
         links: